備長炭 びんちょうずみ Also written びんちょうたん Meanings Noun binchō charcoal (i.e.: high-grade charcoal produced from ubame oak) See also: ウバメガシ. Kanji 備 prepare. Read as ビ. 長 long. Read as チョウ. 炭 carbon. Read as すみ. Jinuma: Japanese Dictionary · Word lists