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Webster 1913 Edition

Verb.

[1st pref.

un-

oil

To remove the oil from.

Dryden.

v.t. To free from oil.

unoil ‎(third-person singular simple present unoils, present participle unoiling, simple past and past participle unoiled)

(transitive) To remove the oil from.
(Can we find and add a quotation of Dryden to this entry?)