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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
respiratory organ of aquatic animals that breathe oxygen dissolved in water

noun.animal

3 Subcategories

ctenidium go
comb-like respiratory structure serving as the gill of certain mollusks
ceras go
one of the often brightly colored and branching hornlike structures on the back of the nudibranch (and other related mollusks) that serve as gills
external gill go
occurs in some mollusks and in tadpoles and other immature amphibians