両りょう凸とつじ字FuriganaMeanings1noun, noun which may take the genitive case particle 'no'biconvexTechnical term used in optics and geometry to describe a lens or shape that is convex on both sides.両りょう凸とつレンズは光ひかりを集あつめるのに使つかわれる。A biconvex lens is used to focus light.
