What is the meaning of Heptone?

(n.) A liquid hydrocarbon, C7H10, of the valylene series.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). Heptone. Retrieved September 23, 2026, from http://smartdefine.org/heptone/definitions/2016041
ChicagoWebster's. 2011. "Heptone" http://smartdefine.org/heptone/definitions/2016041 (accessed September 23, 2026).
HarvardWebster's 2011, Heptone, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/heptone/definitions/2016041>.
MLAWebster's. "Heptone" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/heptone/definitions/2016041>