Webster's English Dictionary

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marl

1. marl \'ma:r(*)l\ \'ma:r-le-\ n [ME, fr. MF marle, fr. ML margila, dim. 
   of L marga marl, fr.]Gaulish : a loose or crumbling earthy deposit (as of 
   sand, silt, or clay) that con tains a substantial amount of calcium 
   carbonate - marly aj
2. marl vt : to dress (land) with marl 
3. marl vt [D marlen, back-formation fr. marling] : to cover or fasten with 
   marline