from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A compound bone with winglike processes, situated at the base of the skull.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A compound bone at the base of the skull behind the eyes.
from the GNU version of the Collaborative International Dictionary of English
- adj. an irregularly shaped bone in front of the occipital in the base of the skull of the higher vertebrates. It is composed of several fetal bones which become united the adult. See Alisphenoid, Basisphenoid, Orbitosphenoid, Presphenoid.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. butterfly-shaped bone at the base of the skull
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