正せい弦げん曲きょく線せんせいげんきょくせんMeanings1noun, noun which may take the genitive case particle 'no'sine curveMathematical term for the graph of the sine function. Used in trigonometry and signal processing.正せい弦げん曲きょく線せんは周しゅう期き的てきな波は形けいを