Definition of moss noun from the Oxford Advanced Learner's Dictionary

 

moss

 noun
noun
BrE BrE//mɒs//
 
; NAmE NAmE//mɔːs//
 
[uncountable, countable] Plants
 
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  • a very small green or yellow plant without flowers that spreads over damp surfaces, rocks, trees, etc. moss-covered walls compare lichen see also Spanish moss See related entries: Plants
  • Word Origin Old English mos ‘bog or moss’, of Germanic origin; related to Dutch mos and German Moos.Idioms
    a rolling stone gathers no moss
     
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    (saying) a person who moves from place to place, job to job, etc. does not have a lot of money, possessions or friends but is free from responsibilities
    See the Oxford Advanced American Dictionary entry: moss