marl

1. an unconsolidated sedimentary rock or soil consisting of clay and lime, formerly used as fertilizer.

   the ancient right to dig marl for fertilizer

   the road cuttings show red and green marls

1. apply marl to.

   small fields were being assiduously marled to produce corn crops

Middle English: from Old French marle, from medieval Latin margila, from Latin marga, of Celtic origin.

1. a mottled yarn of differently coloured threads, or fabric made from this yarn.

   blue marl leggings

late 19th century: shortening of marbled.