To remove air or oxygen from a liquid or substance, typically during industrial or laboratory processes.
From 'de-' (prefix meaning remove) + 'aerate' (to add air). The prefix 'de-' comes from Latin and creates the opposite action of the base verb, a pattern used widely in English for forming antonyms.
Scientists deaerate water or other liquids to study how things behave without oxygen, or to prevent oxidation that would ruin sensitive materials—it's basically removing the invisible stuff we usually want!
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