noun
5th note of the ancient chromatic scale (approx. F♯)
Technical term from traditional Japanese music theory (gagaku). Part of the 十二律 (jūniritsu) system; corresponds to 姑洗 (kosen).
雅楽では、下無は十二律の第五音にあたる。
In gagaku, shimomu is the fifth note of the twelve-tone scale.