CUPULE
cupule
(noun) a sucker on the feet of certain flies
cupule, acorn cup
(noun) cup-shaped structure of hardened bracts at the base of an acorn
Source: WordNet® 3.1
Etymology
Noun
cupule (plural cupules)
Any small structure shaped like a cup, such as at the base of an acorn, or the sucker on the feet of some flies
Source: Wiktionary
Cu"pule (k"pl), n. Etym: [See Cupola.]
1. (Bot.)
Definition: A cuplet or little cup, as the acorn; the husk or bur of the
filbert, chestnut, etc.
2. (Zoöl.)
Definition: A sucker or acetabulum.
Source: Webster’s Unabridged Dictionary 1913 Edition