from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Abnormal smallness of the head.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A neurological disorder in which the person affected has an abnormally small head due to a failure of brain growth.
from The Century Dictionary and Cyclopedia
- n. The condition or character presented by a small or imperfectly developed head.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an abnormally small head and underdeveloped brain
micro- + -cephaly (Wiktionary)