しんぞう
heart
The heart as the organ stored away in there doing the pumping, not the one you fall in love with. A shin しん and a zoo ぞう of a machine. Hers is not well: しんぞう.
心 こころ is the heart you feel things with. 心臓 is the one a doctor puts a stethoscope on.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.