正弦 zhèng xián 🔊 sine + Review this word Meanings zhèng xián (math.) sine Its characters 正zhèngstraightHSK 2弦xiánbow stringHSK 7–9 Words with 正弦 正弦波 zhèng xián bō sine wave 正弦形 zhèng xián xíng sinusoidal (shaped like a sine wave) 正弦定理 zhèng xián dìng lǐ law of sines 双曲正弦 shuāng qū zhèng xián hyperbolic sine or sinh (math.)