肺 means “lung”

はい · hai

Also: lungs

On'yomi (Chinese reading)
ハイ

JLPT N1 · Taught in grade 6 · 9 strokes

The story

Flesh (月) beside a shape like 市, market, with its stroke running straight through: picture the lungs as a market where air comes and goes all day. 肺 is a lung: 肺炎 is pneumonia, and 肺活量 is lung capacity.

Used in 肺 (hai, lung), 肺炎 (haien, pneumonia), and 肺活量 (haikatsuryou, lung capacity)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.