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Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Any of very many isomeric forms of a saturated aliphatic hydrocarbon having 25 carbon atoms, but especially n-pentacosane CH₃(CH₂)₂₃CH₃ that is found in beeswax Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.