Webster's English Dictionary

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moss

1. moss \'mo.s\ \'mo.-.sli-k\ n [ME, fr. OE mo-s; akin to OHG mos moss, L 
   muscus] chiefly Scot  1: BOG, SWAMP; esp : a peat bog  2a: any of a class 
   (Musci) of bryophytic plants having a small leafy often  tufted stem 
   bearing sex organs at its tip; also : a clump or sward of these plants 2b: 
   any of various plants that form a mossy growth  3: a mossy outgrowth or 
   appearance  - moss.like aj
2. moss vt : to cover or overgrow with moss