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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

artifact, artefact go
a man-made object taken as a whole

instrumentation, instrumentality go
an artifact (or system of artifacts) that is instrumental in accomplishing some end

equipment go
an instrumentality needed for an undertaking or to perform a service

setup, apparatus go
equipment designed to serve a specific function

nuclear reactor, reactor go
(physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements

water-cooled reactor
nuclear reactor using water as a coolant

noun.artifact

2 Subcategories

boiling water reactor, BWR go
a nuclear reactor that uses water as a coolant and moderator
pressurized water reactor, PWR go
a nuclear reactor that uses water as a coolant and moderator