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|Noun||1.||natural covering - a natural object that covers or envelops; "under a covering of dust"; "the fox was flushed from its cover"|
natural object - an object occurring naturally; not made by man
scale - a flattened rigid plate forming part of the body covering of many animals
shell - the hard largely calcareous covering of a mollusc or a brachiopod
test - a hard outer covering as of some amoebas and sea urchins
body covering - any covering for the body or a body part
integument - an outer protective covering such as the skin of an animal or a cuticle or seed coat or rind or shell
envelope - a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet"
roof - the inner top surface of a covered area or hollow space; "the roof of the cave was very high"; "I could see the roof of the bear's mouth"
shell - a rigid covering that envelops an object; "the satellite is covered with a smooth shell of ice"
skim - a thin layer covering the surface of a liquid; "there was a thin skim of oil on the water"
slough - any outer covering that can be shed or cast off (such as the cast-off skin of a snake)
snowcap - a covering of snow (as on a mountain peak)
vesture - something that covers or cloaks like a garment; "fields in a vesture of green"
peridium - outer layer of the spore-bearing organ in many fungi
chlamys, floral envelope, perianth, perigone, perigonium - collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils
indusium - a membrane enclosing and protecting the developing spores especially that covering the sori of a fern
bark - tough protective covering of the woody stems and roots of trees and other woody plants