Antimatter Definition

ăntĭ-mătər, ăntī-
anti-matter
noun
A form of matter that is identical to ordinary matter except that it is composed of antielectrons, antiprotons, and antineutrons.
American Heritage
A form of matter in which the electrical charge or other property of each constituent particle is the reverse of that in the corresponding particle of the usual matter of the universe: an atom of antimatter has a nucleus of antiprotons and antineutrons surrounded by positrons.
Webster's New World

(physics) Matter that is composed of the antiparticles of those that constitute normal matter.

Wiktionary

(physics) A form of matter that has a key property, such as charge, opposite to that of ordinary matter.

Wiktionary

Other Word Forms of Antimatter

Noun

Singular:
antimatter
Plural:
antimatters

Origin of Antimatter

  • From anti- +‎ matter.

    From Wiktionary

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antimatter