The Collaborative International Dictionary of English v.0.48:
Biconvex \Bi*con"vex\, a. [Pref. bi- + convex.] Convex on both sides; as, a biconvex lens. [1913 Webster] Bicorned BicornWordNet (r) 3.0 (2006):
biconvex adj 1: convex on both sides; shaped like a lentil [syn: biconvex, convexo-convex, lenticular, lentiform]