'Marl' definitions:

Definition of 'marl'

(from WordNet)
noun
A loose and crumbling earthy deposit consisting mainly of calcite or dolomite; used as a fertilizer for soils deficient in lime

Definition of 'Marl'

From: GCIDE
  • Marl \Marl\, v. t. [imp. & p. p. Marled; p. pr. & vb. n. Marling.] [Cf. F. marner. See Marl, n.] To overspread or manure with marl; as, to marl a field. [1913 Webster]

Definition of 'Marl'

From: GCIDE
  • Marl \Marl\, v. t. [See Marline.] (Naut.) To cover, as part of a rope, with marline, marking a pecular hitch at each turn to prevent unwinding. [1913 Webster]
  • Marling spike. (Naut.) See under Marline. [1913 Webster]

Definition of 'Marl'

From: GCIDE
  • Marl \Marl\, n. [OF. marle, F. marne, LL. margila, dim. of L. marga marl. Originally a Celtic word, according to Pliny, xvii. 7: "Quod genus terrae Galli et Britanni margam vocant." [root]274.] A mixed earthy substance, consisting of carbonate of lime, clay, and sand, in very variable proportions, and accordingly designated as calcareous, clayey, or sandy. See Greensand. [1913 Webster]

Definition of 'marl'

From: GCIDE
  • Greensand \Green"sand`\ (-s[a^]nd`), n. (Geol.) A variety of sandstone, usually imperfectly consolidated, consisting largely of glauconite, a silicate of iron and potash of a green color, mixed with sand and a trace of phosphate of lime. [1913 Webster]
  • Note: [hand]Greensand is often called marl, because it is a useful fertilizer. The greensand beds of the American Cretaceous belong mostly to the Upper Cretaceous. [1913 Webster]