types:
scale
a flattened rigid plate forming part of the body covering of many animals
shell
the hard largely calcareous covering of a mollusk or a brachiopod
test
a hard outer covering as of some amoebas and sea urchins
case,
sheath
an enveloping structure or covering enclosing an animal or plant organ or 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)
cap,
hood
a protective covering that is part of a plant
indument,
indumentum
a covering of fine hairs (or sometimes scales) as on a leaf or insect
roof
the inner top surface of a covered area or hollow space
shell
a rigid covering that envelops an object
skim
a thin layer covering the surface of a liquid
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
peridium
outer layer of the spore-bearing organ in many fungi
sac,
theca
a case or sheath especially a pollen sac or moss capsule
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
canopy
the uppermost layer of branches and foliage in a forest
feather,
plumage,
plume
the light horny waterproof structure forming the external covering of birds
fish scale
scale of the kind that covers the bodies of fish
squama
a protective structure resembling a scale
valve
one of the paired hinged shells of certain molluscs and of brachiopods
valve
the entire one-piece shell of a snail and certain other molluscs
theca
outer sheath of the pupa of certain insects
lorica
a hard protective sheath (as secreted by certain protoctists, for example)
cutis,
skin,
tegument
a natural protective body covering and site of the sense of touch
exuviae
cast-off skins or coverings of various organisms during ecdysis
hair
a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss
headful
a covering over the surface of your head
epicranium
the muscle and aponeurosis and skin covering the cranium
exoskeleton
the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs
epicarp,
exocarp
outermost layer of the pericarp of fruits as the skin of a peach or grape
endocarp,
pit,
stone
the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed
capsule
a dry dehiscent seed vessel or the spore-containing structure of e.g. mosses
cinnamon bark
aromatic bark of Saigon cinnamon used medicinally as a carminative
magnolia
dried bark of various magnolias; used in folk medicine
bur,
burr
seed vessel having hooks or prickles
tanbark
bark rich in tannin; bruised and cut in pieces to use for tanning; spent tanbark used as a ground covering
mezereum
the dried bark of the shrub mezereon
falls
the petals or sepals of a flower that bend downward (especially the outer perianth of an iris)
husk
outer membranous covering of some fruits or seeds
winter's bark
aromatic bark having tonic and stimulant properties
cork
outer bark of the cork oak; used for stoppers for bottles etc.
cork,
phellem
(botany) outer tissue of bark; a protective layer of dead cells