Nantoka/凹凸性āo tū xìng凹凸性 (āo tū xìng) is a Chinese word meaning “(math.) concavity”.Meanings1(math.) concavityCharacters in 凹凸性凹āo · concave; depressed; sunken; indented; female (connector etc)凸tū · to stick out; protruding; convex; male (connector etc)性xìng · natureRelated words性nature同性恋homosexuality性感sex appeal女性woman个性individuality男性the male sex可能性possibility; probability性爱sex性格nature性命life人性human nature异性the opposite sexStudy Chinese with flashcards →