In chemistry, a compound or functional group that has two alkyl groups attached to an atom, usually carbon or nitrogen.
From di- (prefix meaning two) + alkyl (organic chemistry term from alcohol + -yl). Alkyl itself comes from alkane (hydrocarbon) + -yl. This is scientific terminology coined in the 19th century.
Dialkyl compounds are workhorses of industrial chemistry—they're used in everything from pesticides to cosmetics, and understanding their structure is crucial to how pharmaceutical companies design new drugs.
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