1) Bulging 2) Convex 3) Convex on both sides 4) Convexo-convex 5) Curving outward on both sides 6) Lenticular 7) Lentiform 8) Shaped like a lentil 1) Bulging 2) Convex 3) Convexo-convex 4) Lenticular 5) Lentiform 
convex on both sides
• (a.) Convex on both sides; as, a biconvex lens.
(bi″kon-veks´) having two convex surfaces.
A blade shape having two worked faces.
Bi·con'vex adjective [ Prefix bi- + convex .] Convex on both sides; as, a biconvex lens. 
Type: Term Pronunciation: bī-kon′veks Definitions: 1. Convex on two sides; denoting especially a form of lens. Synonyms: convexoconvex
[adj] - convex on both sides
convexo-convex adjective convex on both sides; shaped like a lentil
convex on both sides, as a lens. See diag. under