A hypothetical form of matter composed of antimatter instead of ordinary matter, where electrons and protons are replaced by their opposite-charge particles.
From 'anti-' (opposite) + 'atom,' from Greek 'atomos' (indivisible). Scientists coined this term in the 1930s-40s as they discovered antimatter particles.
If an antiatom touched a regular atom, they'd annihilate each other in a burst of pure energy—antimatter is the most powerful fuel source in the universe, theoretically!
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