正せい則そく曲きょく線せんMeaningsNoun1. regular curveKanji used正correct則rules曲curved線linePitch accentせいそくきょくせんComposed of正せい則そくcorrect; proper; formal; regular; systematic; normal; invertible (matrix); holomorphicNa-adjective曲きょく線せんcurveNoun