Biol. a cuplike structure, as the part of an acorn that holds the nut
Origin of cupuleMiddle English ; from Classical Latin cupula: see cupola
A small cup-shaped structure or organ, such as the cup at the base of an acorn or one of the suckers on the feet of certain flies.
Origin of cupuleLate Latin c&umacron;pula, little cask, diminutive of Latin c&umacron;pa, tub.