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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

sinus
any of various air-filled cavities especially in the bones of the skull

noun.body

4 Subcategories

ethmoid sinus, ethmoidal sinus, sinus ethmoidales go
a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)
frontal sinus go
one of a pair of cavities in the frontal bone
maxillary sinus go
one of a pair of sinuses forming a cavity in the maxilla
paranasal sinus, sinus paranasales, nasal sinus go
any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities