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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

structure, anatomical structure, complex body part, bodily structure, body structure go
a particular complex anatomical part of a living thing

cavity, bodily cavity, cavum go
(anatomy) a natural hollow or sinus within the body

chamber go
an enclosed volume in the body

atrium go
any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)

atrium cordis, atrium of the heart go
the upper chamber of each half of the heart

right atrium, right atrium of the heart, atrium dextrum
the right upper chamber of the heart that receives blood from the venae cavae and coronary sinus

noun.body

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