querciform
Resembling an oak: in particular, resembling the (lobed) leaf of an oak.
uncommon
AGLAOMORPHIA, [...] Sori non-indusiate, rotundate, [...] Fronds coriaceous, dimorphous, the sterile sessile querciform, brown rigid; [...]
Where it comes from
Either formed in English from Latin quercus (“oak”) + -iform, parallel to taxonomic Latin querciformis, or formed in (taxonomic) Latin and borrowed into English.
Adapted from the Wiktionary entry querciform (CC BY-SA 4.0).