created sense approved 凸凸 · tūtū · biconvex — "Initial import from upstream dictionary"
凸凸
tūtū
biconvex
convex on both sides; specifically referring to a lens that is curved outward on both faces
凸凸 (reduplication) → 凸 · tū · protruding
Changed: simplified, traditional, gloss, definition, pinyin, variant pinyin, variants, separable parts, decomposition