• synonyms


[ hep-teyn ]
/ ˈhɛp teɪn /


any of nine isomeric hydrocarbons, C7H16, of the alkane series, some of which are obtained from petroleum: used in fuels as solvents, and as chemical intermediates.

Nearby words

heptahedron, heptahydrate, heptamerous, heptameter, heptametrical, heptane, heptanedioic acid, heptangular, heptanone, heptarchy, heptastich

Origin of heptane

First recorded in 1870–75; hept- + -ane Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for heptane


/ (ˈhɛpteɪn) /


an alkane existing in nine isomeric forms, esp the isomer with a straight chain of carbon atoms (n- heptane), which is found in petroleum and used as an anaesthetic. Formula: C 7 H 16

Word Origin for heptane

C19: from hepta- + -ane, so called because it has seven carbon atoms
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for heptane


[ hĕptān′ ]

A volatile, colorless, highly flammable liquid hydrocarbon obtained in the fractional distillation of petroleum. It is used as a standard in determining octane ratings (combustion characteristics), as an anesthetic, and as a solvent. Heptane is the seventh member of the alkane series. Chemical formula: C7H16.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.