筒

ONとう

KUNつつ

Meanings

pipetubecylinderbarrel

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How to remember

'TOU' — Think of a TOU-be made of bamboo.

The kanji looks like bamboo (竹) growing uniformly (同) into a straight, hollow tube or pipe.

筒つつ

tube; pipe; cylinder

封筒ふうとう

envelope

水筒すいとう

water bottle; canteen

円筒えんとう

cylinder (geometric shape)