こせん 姑洗 LinksSentence search for 姑洗Sentence search for こせんKanji details for 姑 and 洗Edit in JMdict Noun1. (in China) 5th note of the ancient chromatic scale (approx. F sharp)See also 下無, See also 十二律Noun2. third lunar month Discussions Log in to talk about this word.