Moss
/mˈɔs/
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Definition
(noun) Any of various small, green, seedless plants growing on the ground or on the surfaces of trees, stones, etc.; now specifically, a plant of the phylum Bryophyta (formerly division Musci).
Sentence Examples
"A rolling stone gathers no moss" is a proverb.
"A rolling stone gathers no moss" is a saying.
CEFR Practice Quiz
The old stone bridge across the small river was covered in a soft layer of thick green ____ that felt like a carpet.