1) Upper lip shape 
The Cupid`s bow or tubercle is a facial feature where the double curve of a human upper lip is said to resemble the bow of Cupid, the Roman god of erotic love. The peaks of the bow coincide with the philtral columns giving a prominent bow appearance to the lip. It is seen in fetal hydantoin syndrome. The phrase is common in literature, often used....
Type: Term Definitions: 1. the contour of the superior margin of the upper lip.
[n] - the double curve of the upper lip when considered to resemble Cupid`s bow 2. [n] - a curved bow with reversed curve ends
noun a curved bow with reversed curve ends
a classical bow Cupid is traditionally pictured as bearing. · a line or shape resembling this, esp. the line of the upper lip.