Words starting with O

164 words.

• oathbreach Breach or breaking of an oath; perjury.
• obedientiary The holder of a monastic rank or office below that of superior.
• obelion A craniometric point on the sagittal suture between the parietal foramina near the lambdoid suture.
• obelize To mark (a written or printed passage) with an obelus; to judge as spurious or doubtful.
• obelus A symbol resembling a horizontal line (–), sometimes together with one or two dots (for example, ⨪ o
• objurgate To rebuke or scold strongly.
• objurgatory Strongly rebuking or scolding.
• obliviate To forget; to wipe from existence.
• oblongate To extend into an oblong form; to elongate
• obnebulate To cloud or obscure (something).
• obnosis Observing the obvious.
• obnubilate Covered or darkened as with a cloud; overclouded; obscured.
• obnubilation The action of darkening or fact of being darkened, as with a cloud; obscuration.
• obsequent Obedient; submissive; obsequious.
• obsequy The last office for the dead.
• obsidional Pertaining to a siege.
• obsign To seal; to confirm, as by a seal or stamp.
• obsolesce To become or be rendered obsolete; to undergo obsolescence.
• obstaculate To act as an obstacle to; to impede, obstruct.
• obtemperate To obey, comply or submit to.
• obtend To oppose; to hold out in opposition.
• obtruncate To truncate or lop the head off, to decapitate (also figurative).
• obtund To reduce the edge or effects of; to mitigate; to dull.
• obumbrate To shade; to darken; to cloud.
• occhiolism The awareness of the small scope of one's own perspective and the way it limits one's ability to ful
• occiput The back part of the head or skull.
• occultation An astronomical event that occurs when one celestial object is hidden by another celestial object th
• ochlagogue A manipulator of a mob who holds sway by use of inflammatory rhetoric, casting opprobrium, and by ap
• ochlocracy Mob rule; government by the masses; mobocracy.
• ochlophobist A person with a phobia, or fear, of mob-like crowds, as opposed to simply open spaces like agoraphob
• ocnophil A personality type characterised by avoidance of dangerous of unfamiliar situations, and the relianc
• octarine The color of magic, a notional extra color distinct from the colors of the rainbow / normal visible
• octavate To sound one octave higher or lower. — To resonate or sound one octave higher or lower.
• octothorpe The hash or square symbol #, used mainly in telephony and computing.
• octroy To grant (a privilege etc, by a government etc).
• octuplicate A set of eight like or identical things.
• oculus A window or other opening that has an oval or circular shape (as of an eye). — The central boss of a
• odditorium A shop or museum exhibiting unusual curiosities.
• odorate A fragrant substance; perfume.
• offsplit A splitting off or breaking away from; a secession; divergence.
• offstand To endure against; stand or ward off; defend against; withstand; resist.
• offstanding Standing off; standing or situated at a distance; distant; far removed; remote.
• offtake To take off; take away, remove.
• oficina A nitrate-producing factory in a Spanish-speaking country.
• ogdoad A thing made up of eight parts.
• oikophobia Ecophobia; fear of a home environment.
• omadhaun A fool or simpleton; someone out of their senses.
• ombrifuge A refuge from rain, especially an umbrella.
• omnicause The hypothesised relation of major political causes and issues, especially in the context of such re
• omnific Capable of making or doing anything; all-creating.
• omnitude The fact or condition of being all.
• omophagia The eating of raw food, especially raw flesh.
• omophorion A band of brocade originally of wool decorated with crosses and worn on the neck and around the shou
• omphaloskepsis The contemplation of or meditation upon one's navel; navel-gazing.
• omphaloskeptic Likely to, prone to, or engaged in contemplating or meditating upon one's navel.
• onbringing A bringing on; an oncome; inducing; induction.
• oncome To arrive; come to; come on.
• onefold Constituting or being indicative of a single aspect or theme.
• oneirocrisy Prognostication based on the interpretation of dreams.
• oneiromancy Divination by the interpretation of dreams.
• onerate To load; to burden or bedeck.
• onfall A falling on or upon; an attack, onset, or assault.
• onhanger That which, or one who, hangs on to, relies on, or is dependent upon another; a dependent.
• onlead To lead on or forward.
• onsend To send; send on; send out; forward; transmit.
• ontake To take on; undertake; assume.
• oobleck A mixture of cornstarch and water with unusual physical properties.
• oology The study of birds' eggs.
• opacous Not shining or illuminated; dark.
• opisthotonos Sustained tetanic spasm in which the body is bent backwards and stiffened, as produced by various di
• oppilate To block, to stop up, to obstruct.
• oppugn To contradict or controvert; to oppose; to challenge or question the truth or validity of a given st
• opsiblastic Exhibiting a period of dormancy before starting to develop.
• opsimath A person who learns late in life.
• opsoclonus Rapid, uncontrolled eye movement
• optate To choose, settle on, opt.
• optime A student who graduates with second class ("senior optime") or third class ("junior optime") honours
• orature The oral equivalent of literature: a collection of traditional folk songs, stories, etc., that is co
• orbiculate spherical or circular; orbicular
• ordinator One who ordains or establishes; a director.
• orexigenic That stimulates the appetite.
• orexis The affective and conative character of mental activity as contrasted with its cognitive aspect; the
• organoleptic Using the senses rather than instruments.
• organon A set of principles that are used in science or philosophy.
• orgulous Arrogant, haughty, proud.
• orichalcum A valuable yellow metal known to the Ancient Greeks and Romans; now sometimes interpreted as referri
• oriel A large polygonal recess in a building, such as a bay window, forming a protrusion on the outer wall
• orienate To orientate, orient (oneself or something); to be able not to get lost.
• oriflamme The red silk banner of St Denis, which the abbot of St Denis gave to French kings as they rode to wa
• ormer An abalone or sea-ear, particularly Haliotis tuberculata, common in the Channel Islands.
• ormolu To decorate with gilded ormolu articles.
• ornery Disagreeable, stubborn, and troublesome to deal with; cantankerous.
• orphrey Any elaborate embroidery, especially when made of gold thread; an object (such as clothing or fabric
• orpiment Arsenic trisulphide, occurring naturally in crystals or massive deposits, formerly used as a dye or
• orrery A clockwork model of any given solar system.
• ortolan A small European migratory bunting (Emberiza hortulana), once eaten whole as a delicacy.
• osculant Adhering closely; applied to certain creeping animals, such as caterpillars.
• osculation The action of kissing.
• osetra Caviar made from the Russian sturgeon.
• osmazome A substance formerly supposed to impart the characteristic meaty smell and taste to certain dishes.
• ostentate To make an ambitious display of; to exhibit or show boastingly.
• ostiary The mouth of a river; an estuary.
• ostrichism The act of hiding, often unsuccessfully, by ducking one's head out of view.
• otiant At ease, at leisure; idling, indolent.
• otiosity The state or quality of being otiose.
• otrovert A person who is unable to feel a connection to social groups or collectives, as distinct from both a
• ouche A brooch or clasp for fastening a piece of clothing together, especially when set with jewels or val
• ourie Chill; having the sensation of cold; drooping; shivering.
• ousia The essential nature or ‘substance’ of God, often as contrasted to the ‘energies’ (external actions
• outbring To bring out; deliver; utter; express.
• outbye In the direction away from the coal face.
• outdraw To extract or draw out.
• outfall A sudden eruption of troops from a fortified place; sally.
• outfangthief A privilege of some feudal lords permitting them to execute summary judgment upon thieves (particula
• outflight The act or process of flying out.
• outformation Something that is sent out or broadcast from the source that formed it.
• outgo A cost, expenditure, or outlay.
• outland Provincial: from a province (of the same land).
• outlaugh To ridicule or laugh someone out of a purpose, principle, etc.; laugh down; discourage or put out of
• outlead An electrical lead for outward-going current.
• outrance The furthest degree or extremity, going beyond bounds or propriety.
• outroduction The closing remarks made at the end of a book, story, performance, etc.
• outroductory Related or referring to an outro or closing section.
• outsend That which is sent out; a deliverable.
• outsending A message abroad; something that is sent out.
• outshow To show or present publicly; exhibit openly.
• outsight Sight for that which is on the outside; the ability or capacity to perceive or anticipate external t
• outspread Extended outward, as one's arms; stretched out.
• outstand To resist effectually; withstand; sustain without yielding.
• outstretch To extend by stretching.
• outsweat To sweat out or cause to sweat out
• overbusy To busy or involve (oneself) too thoroughly in something.
• overegg Chiefly in over-egg the pudding: to spoil (something) by exaggerating it, or an aspect of it; to ove
• overfall To fall on or spill over so as to cover (something).
• overfeeble Feeble to an excessive or debilitating degree.
• overfold A fold whereby the strata are forced through an angle of more than 90 degrees, so that younger strat
• overgang To go beyond or above; to exceed.
• overget To get more than expected or due.
• overgo To cross, go over (a barrier etc.); to surmount.
• overhold To overvalue; overestimate; hold or estimate at too dear a rate.
• overjaw The upper jaw (superior maxillary).
• overlabour To cause to labour excessively; to overwork.
• overlead To lead excessively or too much.
• overleave To leave (something) over; cause to remain or be left.
• overlight Too light or frivolous; giddy.
• overlive To survive; to live past.
• overmorrow Of or relating to the day after tomorrow.
• overplus That which remains beyond what is necessary or required; a surplus.
• overread To read over, or peruse.
• oversend To send an amount greater than what is required; to oversupply.
• overset Copy or type set in excess of a given space; (countable) an instance of this.
• oversharent To overdocument one's child's upbringing on social media; to sharent excessively.
• oversightly Offering a clear and readily grasped overview (of something).
• oversit To preside over, govern, rule; to control.
• oversour Overly or excessively sour; too sour.
• oversow To sow (seed) where something has already been sown.
• overspread To spread over or across (something); cover over; be scattered over; permeate, overrun.
• overstand To stand or insist too much or too long; overstay.
• overween To think too highly or arrogantly of (oneself).
• overweigh To exceed in weight, outweigh; to preponderate; to weigh down.
• ovolo A classical convex moulding carved with an egg and dart ornament.
• oxgang The area of land that could be plowed by an ox in a year, ¹⁄₈ hide or carucate and notionally 15 acr
• oxter To hug with the arms, or support by taking the arm of.
• oxymel A mixture of honey, water, and vinegar, boiled to a syrup, sometimes mixed with herbs or spices.