A chemical compound formed by removing water from another substance, especially a compound formed when water is removed from an acid or base.
From Greek 'an-' (without) + 'hydro' (water) + the chemistry suffix '-ide'. The term describes molecules that have undergone dehydration to form new compounds.
Sulfuric acid anhydride (sulfur trioxide) is the classic example—it's incredibly reactive and reabsorbs water so aggressively it can burn skin, making it one of chemistry's most aggressive substances!
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