A substance that opposes or counteracts the effect of another substance; an opposing or antithetical substance.
From anti- (against) + substance (from Latin substantia, essential nature or material). This is a theoretical term used in philosophy and chemistry for conceptually opposing substances.
While antimatter is a real physics concept with actual opposite particles, 'antisubstance' is more philosophical—it describes any substance that works against another, showing how the anti- prefix extends into abstract thinking!
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