hardground en · NOUN
Etymology
From hard + ground.
Meanings
-
A lithified seafloor.
Ancient hardgrounds are found in limestone sequences and distinguished from later-lithified sediments by evidence of exposure to normal marine waters.
- A hard stratum of rock other than coal.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| hardgrounds | Number=Plur | lexicographic |