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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

object, physical object go
a tangible and visible entity

whole, unit go
an assemblage of parts that is regarded as a single entity

living thing, animate thing go
a living (or once living) entity

organism, being go
a living thing that has (or can develop) the ability to act or function independently

microorganism, micro-organism go
any organism of microscopic size

protoctist go
any of the unicellular protists

protozoan, protozoon
any of diverse minute acellular or unicellular organisms usually nonphotosynthetic

noun.animal

9 Subcategories

sarcodinian, sarcodine go
protozoa that move and capture food by forming pseudopods
rhizopod, rhizopodan go
protozoa characterized by a pseudopod
arcella go
an amoeba-like protozoan with a chitinous shell resembling an umbrella
difflugia go
a protozoan with an ovoid shell of cemented sand grains
ciliate, ciliated protozoan, ciliophoran go
a protozoan with a microscopic appendage extending from the surface of the cell
euglena go
minute single-celled green freshwater organism having a single flagella
flagellate, flagellate protozoan, flagellated protozoan, mastigophoran, mastigophore go
a usually nonphotosynthetic free-living protozoan with whiplike appendages
plantlike flagellate go
unicellular organisms having many characteristics of typical algae
sporozoan go
parasitic spore-forming protozoan