| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Humus coal | Mining | A. Coal composed of anthraxylon in varying proportions and of varying thicknesses, associated with transparent attritus b. Amorphous brown to black coal formed from vegetable matter and insoluble under continuous boiling in caustic alkalies; also insoluble in water and benzol. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
