from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A congenital deformity characterized by a vertical cleft or pair of clefts in the upper lip, with or without involvement of the palate.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun teratology
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a congenital cleft in the middle of the upper lip
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