A hydrocarbon compound with 21 carbon atoms in its molecular structure.
From Greek 'heneicosa' (twenty-one) + '-ane' (suffix for saturated hydrocarbons). The Greek prefix combines 'hen' (one) + 'eikosa' (twenty) to make twenty-one, following the systematic naming of alkanes.
Organic chemistry has this beautiful logic—once you know that '-ane' means saturated hydrocarbon and 'heneicosa' means 21, you can instantly understand 'heneicosane' has 21 carbons, which is why chemists love building words from Greek and Latin roots that stack together predictably.
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