MOSS

I. noun Etymology: Middle English, from Old English mos; akin to Old High German mos ~, Latin muscus Date: before 12th century bog , swamp , 2. any of a class (Musci) of bryophytic plants characterized by a gametophyte having a small leafy often tufted stem bearing sex organs at its tip, any of various plants resembling ~ in appearance or habit of growth, a ~y covering, ~like adjective II. transitive verb Date: 15th century to cover or overgrow with ~