phyllon
A leaf, or something (flat) resembling a leaf.
countable, uncommon
In this following the analogy of phyton already appropriated for the integer of the axis plus the phyllon or phylla it bears.
Where it comes from
Borrowed from Latin phyllon, from Ancient Greek φύλλον (phúllon, “leaf”). Doublet of phyllo, distantly also with foil, folio, and folium.
Adapted from the Wiktionary entry phyllon (CC BY-SA 4.0).