| 1. | Geology. a friable earthy deposit consisting of clay and calcium carbonate, used esp. as a fertilizer for soils deficient in lime. |
| 2. | Archaic. earth. |
| 3. | to fertilize with marl. |
| marl (märl) Pronunciation Key
A crumbly mixture of clays, calcium and magnesium carbonates, and remnants of shells that forms in both freshwater and marine environments. |