Source : Webster's Revised Unabridged Dictionary (1913)

Convexo-convex \Con*vex"o-con"vex\, a.
   Convex on both sides; double convex. See under {Convex}, a.

Source : WordNet®

convexo-convex
     adj : convex on both sides; lentil-shaped [syn: {biconvex}, {lenticular},
            {lentiform}]