marl1
  
  n.
 an unconsolidated sedimentary rock or soil consisting of clay and lime, formerly used as fertilizer.
v.
 apply marl to.
 
  Derivative
  
  Etymology
  ME: from OFr. marle, from med. L. margila, from L. marga, of Celtic origin.
 
  
    
marl2
  
  n.
 a mottled yarn or fabric.
 
  Derivative
  
  Etymology
  C19: shortening of marbled.