Adjective: biconvex ,bI,kón'veks or bI'kón,veks- Convex on both sides; shaped like a lentil
"The image of a point at infinite distance from the biconvex lens is on the opposite side of the lens";
- convexo-convex, lenticular, lentiform
See also: bulging, convex
Encyclopedia: Biconvex