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1 [mass noun] a small flowerless green plant which lacks true roots, growing in low carpets or rounded cushions in damp habitats and reproducing by means of spores released from stalked capsules: the trees are overgrown with vines and moss [count noun]: the bog is home to rare mosses- Class Musci, division Bryophyta
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used in names of algae, lichens, and higher plants resembling moss, e.g. reindeer moss, Ceylon moss, Spanish moss.
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2 (also moss green) [mass noun] a green colour like that of moss.
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3Scottish & Northern English a bog, especially a peat bog.
