peat mossDefinition of peat moss noun 1 [mass noun] a large absorbent moss which grows in dense masses on boggy ground, where the lower parts decay slowly to form peat deposits. Genus Sphagnum, family Sphagnaceae: many species 2a lowland peat bog: eight feet down in a peat moss at Strathmorepeat moss in other Oxford dictionaries Definition of peat moss in the US English dictionary
