noun 1.Botany.a.a cup-shaped whorl of hardened, cohering bracts, as in the acorn. See illus. under
acorn.
b.a cup-shaped outgrowth of the thallus of certain liverworts.
c.the apothecium of a cup fungus.
2.Zoology. a small cup-shaped sucker or similar organ or part.
Origin: 1820–30; <
Neo-Latin cūpula, Late Latin: small tub; see
cupola