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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

natural object go
an object occurring naturally

body go
an individual 3-dimensional object that has mass and that is distinguishable from other objects

particle, subatomic particle go
a body having finite mass and internal structure but negligible dimensions

elementary particle, fundamental particle go
(physics) a particle that is less complex than an atom

lepton go
an elementary particle that participates in weak interactions

electron, negatron
an elementary particle with negative charge

noun.object

4 Subcategories

delta ray go
an electron ejected from matter by ionizing radiation
free electron go
electron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field
photoelectron go
an electron that is emitted from an atom or molecule by an incident photon
valence electron go
an electron in the outer shell of an atom which can combine with other atoms to form molecules