Read Edit View history 凸凸 tūtū biconvex Origin Definitions Defs Strokes Stroke Words Sentences Sents 凸凸 tūtū biconvex convex on both sides; specifically referring to a lens that is curved outward on both faces
凸凸 tūtū biconvex convex on both sides; specifically referring to a lens that is curved outward on both faces