In chemistry, a group of seven carbon and hydrogen atoms bonded together, often found as a side chain in organic molecules.
From Greek 'hepta' (seven) plus the chemistry suffix '-yl' for hydrocarbon groups. Became standard in organic chemistry nomenclature in the 1800s.
Chemists use '-yl' words like 'heptyl' as prefixes to describe molecular building blocks—it's like saying 'a seven-carbon attachment'—so 'heptyl alcohol' is a seven-carbon chain with a reactive alcohol group on the end.
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