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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

organ go
a fully differentiated structural and functional unit in an animal that is specialized for some particular function

internal organ, viscus go
a main organ that is situated inside the body

respiratory organ go
any organ involved in the process of respiration

gill, branchia go
respiratory organ of aquatic animals that breathe oxygen dissolved in water

external gill
occurs in some mollusks and in tadpoles and other immature amphibians

noun.animal

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