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antiatom

American  
[an-tee-at-uhm, an-tahy-] / ˈæn tiˌæt əm, ˈæn taɪ- /

noun

Physics.

  1. an atom of antimatter.

antiatom Scientific  
/ ăn′tē-ăt′əm,ăn′tī- /

  1. An atom composed of antiparticles. An antiatom consists of positrons, antiprotons, and antineutrons. It has the same mass and spin as an ordinary atom, and the same amount of charge and magnetic moment, but the charge and magnetic moment are the opposite of those of an ordinary atom.

Etymology

Origin of antiatom

First recorded in 1965–70; anti- + atom

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

An antiatom, for example, composed of positrons, antiprotons, and antineutrons should have the same atomic spectrum as its matter counterpart.

From Textbooks • Aug. 12, 2015

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.