蓋 — “Cover / Lid / Flap” in Japanese

Master (高手)がい, かい, こう, ふた, けだ, おお, かさ, かこう

Radical ⾋ · radical 140 The building block this kanji is filed under

“Cover / Lid / Flap” in Japanese is 蓋, read gai, kai, kou (がい, かい, こう, ふた, けだ, おお, かさ, かこう). It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 蓋 (lid).

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What does 蓋 mean?

Full details, readings & example

Kanji	蓋
Meaning	Cover / Lid / Flap
Readings	がい, かい, こう, ふた, けだ, おお, かさ, かこう
Grade	Master (高手 · secondary school)
Curriculum	Jōyō kanji · Japanese secondary school (JLPT N1–N2)
Example	蓋 (lid)

How to read 蓋

蓋 is read gai (がい) or kai (かい) or kou (こう) or futa (ふた) or keda (けだ) or oo (おお) or kasa (かさ) or kakou (かこう) depending on the word.

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Kanji read the same way as 蓋

Same sound, different character — the classic trap. Compare them side by side:

Updated: 2026-08-28