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N3Kanji
筒
tube, cylinder
Readings
- On
- トウ
- Kun
- つつ
Examples
筒（つつ）、水筒（すいとう）、封筒（ふうとう）
tube, water bottle, envelope
Note
On-reading (トウ) is used in compounds; kun-reading (つつ) is used standalone or with okurigana. Appears in many compounds — memorize the key ones rather than the kanji in isolation.
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