natural covering

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WordNet Dictionary
	Definition:		[n]  a natural object that covers or envelops; "under a covering of dust"; "the fox was flushed from its cover"
	Synonyms:		cover, covering
	See Also:		bark, blanket, body covering, case, crust, eggshell, encrustation, envelope, floral envelope, incrustation, indusium, integument, mantle, natural object, perianth, pericarp, peridium, sac, scale, seed vessel, sheath, shell, slough, snowcap, test, theca, vesture