What do a.m. and p.m. stand for?


[ok-teyn] /ˈɒk teɪn/
noun, Chemistry
any of 18 isomeric saturated hydrocarbons having the formula C 8 H 1 8 , some of which are obtained in the distillation and cracking of petroleum.
Origin of octane
1870-75; oct- + -ane Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for octane
  • It helps to have some siblings to spread around the high octane attention and expectations.
  • Garner likes that movie a bit too much-the story line is even worse than he says-but maybe he still smells high-octane gasoline.
  • Instead, his usual mode of speech is fuelled by high-octane superlatives.
  • High octane gasoline as well as ethyl alcohol fuel blends typically stay in the same price range, while alcohol has been cheaper.
  • But the science behind high-octane sweets is anything but fanciful.
  • Two high-octane guys from different cultures, sharing a vision and becoming a team.
  • One of the biggest differences between water and an oily liquid such as octane, a component of petroleum, is surface tension.
  • And yet what the average pigeon lacks in iq octane, it appears to make up in reproductive prowess.
  • To avoid engine knock, the team's engine runs on ethanol, which has a higher octane number than gasoline.
  • For example, gasoline produced via direct liquefaction of coal has a high aromatic content, giving it a high octane rating.
British Dictionary definitions for octane


a liquid alkane hydrocarbon found in petroleum and existing in 18 isomeric forms, esp the isomer n-octane. Formula: C8H18 See also isooctane
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
Cite This Source
Word Origin and History for octane

hydrocarbon of the methane series, 1872, coined from octo- (see octa-) + -ane; so called because it has eight carbon atoms. A fuel's octane rating, in reference to its anti-knocking quality, is attested from 1932.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
octane in Science
Any of several hydrocarbons having eight carbon atoms connected by single bonds. It is commonly added to gasoline to prevent knocking from uneven burning of fuel in internal-combustion engines. Octane is the eighth member of the alkane series. Chemical formula: C8H18.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for octane

Some English speakers likely know this word

Word Value for octane

Scrabble Words With Friends

Quotes with octane

Nearby words for octane