Source : Webster's Revised Unabridged Dictionary (1913)

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.