筒 JLPT N2 Kanji 筒 — cylinder, pipe, tube, gun barrel, sleeve JLPT N2 12 strokes Secondary (Jōyō) Radical 竹 #1631 most frequent Readings On'yomiトウ Kun'yomiつつ Example words 封筒ふうとうenvelope 筒つつ(1) pipe; tube; cylinder (2) gun barrel (3) gun 水筒すいとうcanteen; flask; water bottle; thermos