筒 とう Meanings Suffix pipe; tube See also: 筒 (つつ). Counter counter for injection ampoules Kanji 筒 tube. Read as トウ. Words containing 筒 気筒 (きとう) cylinder 封筒 (ふうとう) envelope 円筒 (えんとう) cylinder And 38 more. Jinuma: Japanese Dictionary · Word lists