真髄 しんずい Also written 神髄 Meanings Noun essence; quintessence; spirit; soul; heart; pith (and marrow) Kanji 真 true. Read as シン. 髄 marrow. Read as ズイ. Example sentences 自由こそまさに我々の民主主義の神髄だ。Freedom is the very essence of our democracy. 実はこれこそが科学の神髄なのである。This, in essence, is the secret of science. Jinuma: Japanese Dictionary · Word lists