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Webster 1913 Edition
Heptane
Hep′tane
,Noun.
[Gr.
ἑπτά
seven.] (Chem.)
Any one of several isometric hydrocarbons,
C7H16
, of the paraffin series (nine are possible, four are known); – so called because the molecule has seven carbon atoms. Specifically, a colorless liquid, found as a constituent of petroleum, in the tar oil of cannel coal, etc.