Marl

Part of speech: noun (n.)

A mixed earthy substance, consisting of carbonate of lime, clay, and sand, in very varivble proportions, and accordingly designated as calcareous, clayey, or sandy. See Greensand.

Part of speech: verb (v.)

To cover, as part of a rope, with marline, marking a pecular hitch at each turn to prevent unwinding. Marling spike. (Naut.) See under Marline.

Part of speech: verb (v.)

To overspread or manure with marl; as, to marl a field.