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naphthenic

[naf-theen, nap-]

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noun Chemistry.

any of a group of hydrocarbon ring compounds of the general formula, C_nH_2n, derivatives of cyclopentane and cyclohexane, found in certain petroleums.

Origin:
1840–50; naphth- + -ene

Related forms

naph·the·nic

[naf-thee-nik, -then-ik, nap-] , adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Naphthenic is always a great word to know.

So is callithumpian. Does it mean:

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

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naphthenic

naph·thene