Definition of moss noun from the Oxford Advanced American Dictionary

 

moss

 noun
noun
NAmE//mɔs//
 
[uncountable, countable]
 
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  • a very small green or yellow plant without flowers that spreads over damp surfaces, rocks, etc. moss-covered walls compare lichen see also peat moss, Spanish moss
  • Idioms
    a rolling stone gathers no moss(saying)
     
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    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 Learner's Dictionary entry: moss