marl (märl) n. A crumbly mixture of clays, calcium and magnesium carbonates, and remnants of shells that is sometimes found under desert sands and used as fertilizer for lime-deficient soils. tr.v.
marled, marl·ing, marls To fertilize with such a mixture.
[Middle English marle, from Old French, from Medieval Latin margila, marla, diminutive of Latin marga, marl, of Celtic origin.] marl'y adj.
"clayey soil used for fertilizer," 1372, from O.Fr. marle (Fr. marne), from L.L. marglia, dim. of marga, which is said by Pliny to be a Gaulish word, but modern Celt. cognates are considered to be borrowed from Eng. or Fr.