しんずい 真髄 Common word Wanikani level 55 LinksSentence search for 真髄Sentence search for しんずいSentence search for 神髄Kanji details for 真 and 髄Edit in JMdict Noun1. essence; quintessence; spirit; soul; heart; pith (and marrow)Other forms神髄 【しんずい】 Discussions Log in to talk about this word.