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

 

sphagnum

 noun
noun
BrE BrE//ˈsfæɡnəm//
 
; NAmE NAmE//ˈsfæɡnəm//
 
(also Sphagnum moss)[uncountable]
 
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a type of moss that grows in wet areas, used especially for planting plants in pots, making fertilizer, etc. Word Origin mid 18th cent.: modern Latin, from Greek sphagnos, denoting a kind of moss.
See the Oxford Advanced American Dictionary entry: sphagnum