Etymology
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cupule (n.)

"small cup-shaped depression or object," 1830, from Modern Latin cupula, diminutive of Latin cupa "cask, barrel" (see cup (n.)).  

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Definitions of cupule

cupule (n.)
cup-shaped structure of hardened bracts at the base of an acorn;
Synonyms: acorn cup
cupule (n.)
a sucker on the feet of certain flies;
From wordnet.princeton.edu