古刀 ことう Meanings Noun old sword; old katana kotō; old sword (i.e.: katana forged before the advent of the Keichō era) See also: 慶長 (けいちょう). See also: 新刀 (しんとう). Kanji 古 old. Read as コ. 刀 katana. Read as トウ. Jinuma: Japanese Dictionary · Word lists