肝腎
かんじん · kanjin · JLPT N1 · na-adj
essential
肝 — flesh radical 月 (肉) + 干 gān phonetic
A semantic-phonetic compound. The left side 月 is the 'flesh/meat' radical (from 肉), used for body organs. The right side 干 supplies the sound 'gān'. Together they denote the liver, an internal organ.