Main Entry: cu·pule

Pronunciation: \ˈkyü-(ˌ)pyül\

Function: noun

Etymology: New Latin cupula, from Late Latin, diminutive of Latin cupa tub — more at hive

Date: 1826

: a cup-shaped anatomical structure: as a : an involucre characteristic of the oak in which the bracts are indurated and coherent b : an outer integument partially enclosing the seed of some seed ferns