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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

object, physical object go
a tangible and visible entity

whole, unit go
an assemblage of parts that is regarded as a single entity

natural object go
an object occurring naturally

covering, cover, natural covering go
a natural object that covers or envelops

shell
the hard largely calcareous covering of a mollusc or a brachiopod

noun.animal

7 Subcategories

valve go
one of the paired hinged shells of certain molluscs and of brachiopods
valve go
the entire one-piece shell of a snail and certain other molluscs
scallop shell go
a shell of a scallop
oyster shell go
a shell of an oyster
phragmocone, phragmacone go
the thin conical chambered internal shell (either straight or curved) of a belemnite
seashell go
the shell of a marine organism
clamshell go
the shell of a clam