acorn cup

from WordNet (r) 3.0 (2006)
acorn cup
    n 1: cup-shaped structure of hardened bracts at the base of an
         acorn [syn: {cupule}, {acorn cup}]
from The Collaborative International Dictionary of English v.0.48
Acorn cup \A"corn cup\
   The involucre or cup in which the acorn is fixed.
   [1913 Webster]
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