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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

thing go
a separate and self-contained entity

part, piece go
a portion of a natural object

body part go
any part of an organism such as an organ or extremity

tissue go
part of an organism consisting of an aggregate of cells having a similar structure and function

animal tissue go
the tissue in the bodies of animals

membrane, tissue layer go
a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants

fetal membrane go
any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus

allantois
the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)

noun.animal

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