凸とつ面めんとつめんじ字FuriganaAudioMeanings1noun, noun which may take the genitive case particle 'no'convex surface; convexTechnical term used in geometry, optics, and engineering to describe a surface that curves outward. Often used attributively with の.このレンズは凸とつ面めんになっている。Break this sentence down in the analyzerThis lens has a convex surface.凸とつ面めん鏡きょうは光ひかりを広ひろげる。Break this sentence down in the analyzerA convex mirror spreads light.
