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a black, combustible, mineral solid resulting from the partial decomposition of vegetable matter ... over a period of millions of years, hard coal - all coal of higher rank than lignite. ...As opposed to soft coal., must v hallikasmust taimse päritoluga põlev settekivim
hiili . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/hiili/1/fin (20.06.2026)
