coalified
/ˈkoʊlɪfaɪd/
adjective
- Converted into coal through natural geological processes.
- Miners discovered a layer of coalified plant remains.
- The coalified wood still showed some of its original grain.
- Coalified fossils provide clues about prehistoric vegetation.
verb
- Past tense of coalify: to have turned into coal.
- Once the peat coalified, it became a valuable fuel source.
- Over millions of years, the swamp vegetation coalified into a thick seam.
- The organic matter coalified under intense heat and pressure.