Etymology
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sphagnum (n.)

genus of mosses, peat-moss, 1741, Modern Latin, from Latin sphagnos, a kind of lichen, from Greek sphagnos "a spiny shrub, a kind of moss," of unknown origin. Related: Sphagnous.

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Definitions of sphagnum

sphagnum (n.)
any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat;
Synonyms: sphagnum moss / peat moss / bog moss
From wordnet.princeton.edu