Denoting the isolated central soft-tissue segment of the upper lip in the embryonic state and in an unrepaired bilateral cleft palate. ... (05 Mar 2000) ... 
Type: Term Pronunciation: prō-lā′bē-ăl Definitions: 1. Denoting the isolated central soft-tissue segment of the upper lip in the embryonic state and in an unrepaired bilateral cleft lip and palate.