- anatomy either of two long bony plates extending downwards from each side of the sphenoid bone within the skull
C18 pterygoid, from Greek pterugoeidēs, from pterux wing; see -oid
- A long process of the sphenoid bone extending downward from the junction of its body and great wing.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.