Webster's English Dictionary

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sphagnum

sphag.num \'sfag-n*m\ n [NL, genus name, fr. L sphagnos, a moss, fr. Gk] 1: 
   any of a large genus (Sphagnum, coextensive with the order Sphagna les) of 
   atypical mosses that grow only in wet acid areas where their remains become 
   compacted with other plant debris to form peat 2: a mass of sphagnum plants