ce·tane

[see-teyn]
noun
a colorless, liquid hydrocarbon of the alkane series, C 16 H 34 , used as a solvent and in cetane number determinations.

Origin:
1930–35; cet(yl) + -ane

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Collins
World English Dictionary
cetane (ˈsiːteɪn) [Click for IPA pronunciation guide]
 
n
Also called: hexadecane a colourless insoluble liquid alkane hydrocarbon used in the determination of the cetane number of diesel fuel. Formula: C16H34
 
[C19: from Latin cētus whale + -ane, so called because related compounds are found in sperm whale oil]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Cetane is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
American Heritage
Science Dictionary
cetane   (sē'tān')  Pronunciation Key 
A colorless liquid hydrocarbon derived from petroleum. It is used as a solvent and a component of diesel fuels. Chemical formula: C16H34.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The cetane index is a correlate of the cetane number, which is a measure of the
  ease with which a fuel is ignited.
Cetane rating is the diesel equivalent to gasoline's octane rating.
Cetane may therefore not be correlated unequivocally to ignition delay in
  modern engines.
Cetane controls the delay time for ignition in compression ignition piston
  engines.
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