from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The involucre or cup in which the acorn is fixed.
from the GNU version of the Collaborative International Dictionary of English
- The involucre or cup in which the acorn is fixed.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. cup-shaped structure of hardened bracts at the base of an acorn
acorn + cup (Wiktionary)