[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.
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