赤せき色しょく骨こつ髄ずいMeaningsNoun1. red bone marrow; red marrowKanji used赤red色color骨bone髄marrowComposed of赤せき色しょくred; red color; communist; socialist; left-wingNoun骨こつ髄ずいbone marrow; medulla; heart's core; depths of one's heartNoun