A chemical compound containing seven methyl groups or seven similar structural units bonded together.
From Greek 'hepta' (seven) + 'mer' (part) + chemical suffix '-ide'. The term was constructed in 19th-century chemistry to name compounds with seven repeating units.
Chemistry uses number-prefixes like 'hepta-' to tell you exactly how many structural parts make up a molecule—it's like a formula written right into the word itself, making chemistry names incredibly precise once you learn the code.
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