American Heritage® Dictionary of the English Language, Fourth
Edition - n. 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. Century Dictionary and Cyclopedia - n. A small
cup-shaped depression, as in rock. - n. In botany: A form of
involucre, occurring in the oak, beech, chestnut, and hazel,
consisting of bracts which in fruit cohere into a kind of cup.
In fungi, a receptacle shaped like the cup of an acorn, as in
Peziza. - n. In entomology, a little cup-shaped organ;
specifically, one of the sucking-disks on the lower surface of
the tarsi of certain aquatic beetles. - n. Also cupula. - n. Any
small structure shaped like a cup, such as at the base of an
acorn, or the sucker on the feet of some flies GNU Webster's
1913 - n. (Bot.) A cuplet or little cup, as of the acorn; the
husk or bur of the filbert, chestnut, etc. - n. (Zoöl.) A sucker
or acetabulum. - n. cup-shaped structure of hardened bracts at
the base of an acorn - n. a s