鉄心石腸 てっしんせきちょう Meanings Noun will of iron Kanji 鉄 iron. Read as テツ. 心 heart. Read as シン. 石 stone. Read as セキ. 腸 intestine. Read as チョウ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists