せきたんぶくろ 石炭袋 LinksSentence search for 石炭袋Sentence search for せきたんぶくろKanji details for 石, 炭 and 袋Edit in JMdict Noun1. Coalsack NebulaAstronomy, See also コールサックNoun2. coal sack; coal bag Discussions Log in to talk about this word.