疫 means “epidemic, plague”

えき · eki

On'yomi (Chinese reading)
エキ, ヤク

JLPT N1 · Taught in secondary school · 9 strokes

The story

Sickness (疒) swinging a club (殳): a disease that strikes down a whole town. 疫 is epidemic: 免疫 is immunity, 検疫 is the quarantine check at airports and ports, and a 疫病神, a plague god, is a jinx.

Used in 免疫 (men'eki, immunity), 検疫 (ken'eki, quarantine), and 疫病 (ekibyou, epidemic/plague)

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