1. (Zoology) either of a pair of sensory appendages that arise from the mouthparts of crustaceans and insects. 2. (Zoology) either of a pair of tactile organs arising from the head or anterior end of certain annelids and molluscs. [C19: from French, from Latin palpus a touching]
Convex, meaning curving out or extending outward (compare concave), may refer to: Convex set in mathematics Convex function in mathematics convex polygon a polygon in which no line segment between two points on the boundary ever goes outside the polygon.
In a polygon, a vertex is called  convex  if the internal angle of the polygon, that is, the angle formed by the two edges at the vertex, with the polygon inside the angle, is less than Ï radians (180Â°, two right angles) ; otherwise, it is called concave or reflex.