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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

device go
an instrumentality invented for a particular purpose

conductor go
a device designed to transmit electricity, heat, etc.

electrode go
a conductor used to make electrical contact with some part of a circuit

cathode go
a negatively charged electrode that is the source of electrons entering an electrical device

cold cathode
a cathode that is a source of electrons without being heated

noun.artifact

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