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.
So one type of convex quadrilateral is a trapezoid. And a trapezoid is a convex quadrilateral, and sometimes the definition here is a little bit-- different people will use different definitions. So some people will say a trapezoid is a quadrilateral that has exactly two sides that are parallel to each other.