[naf-theen, nap-]
noun Chemistry.
any of a group of hydrocarbon ring compounds of the general formula, C n H 2n , derivatives of cyclopentane and cyclohexane, found in certain petroleums.

1840–50; naphth- + -ene

naphthenic [naf-thee-nik, -then-ik, nap-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
naphthene (ˈnæfθiːn, ˈnæp-)
any of a class of cycloalkanes, mainly derivatives of cyclopentane, found in petroleum
[C20: from naphtha + -ene]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
naphthene   (nāf'thēn', nāp'-)  Pronunciation Key 
See cycloalkane.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The time required for division was significantly increased in ace- naphthene-treated cells.
The fractional distillation of crude oils produces either paraffine or naphthene.
In sewer systems the presence of oils and immiscible liquids, such as naphthene and ether, may cause explosive conditions.
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