cleft lip

n.
A congenital deformity characterized by a vertical cleft or pair of clefts in the upper lip, with or without involvement of the palate.

n

A congenital anomaly of the face caused by the failure of fusion between embryonic maxillary and medial nasal processes.

Cleft lip and palate. (Zitelli/Davis, 2002)

A congenital defect in which the upper lip is not properly fused together, so that a narrow crack or fissure splits the lip. It can be repaired through plastic surgery.

n.

A congenital facial deformity of the lip, usually the upper lip, due to a mesodermal deficiency or to a failure of merging in one or more of the embryologic processes that form the lip; it is frequently associated with cleft tooth socket and cleft palate. Also called cheiloschisis, harelip.

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The noun has one meaning:

Meaning #1: a congenital cleft in the middle of the upper lip
  Synonyms: harelip, cheiloschisis

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