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せきたんとうNoun
1

Rare term

coal tower

含水んすいたんそNounFreq #170771
1

Obsolete term

carbohydrate

アセチレン系化水素セチレンけいたんかすいそNoun
1

Rare term

alkyne

エチレン系化水素チレンけいたんかすいそNoun
1

Rare term

alkene; olefin; olefine

メタン系化水素タンけいたんかすいそNoun
1

Rare term

alkane

消ししずみNounFreq #24345
1

partly burned charcoal

2

Archaic

servant boy at a brothel or teahouse