underclay
noun
: a layer of clay beneath a coal bed often containing fossil roots of coal plants and constituting fireclay
Word History
Etymology
under entry 3 + clay
- green
- green acid
- green adder's mouth
- green alder
- green alga
- green algae
- green algas
- green almond
- green aloe
- green amaranth
- green anole
- green anoles
- green aphis
- green apple aphid
- green around the gills
- green arrow arum
- green ash
- green bass
- Green Bay
- green bean
- Green Beret
- green book
- green bristle
- green bristlegrass
- green broke