Crude oil
Crude oil means a naturally occurring mixture consisting predominantly of hydrocarbons and/or sulfur, nitrogen, and oxygen derivatives of hydrocarbons that is removed from the earth in a liquid state or is capable of being so removed.
Source
40 CFR § 63.561
Scoping language
As used in this subpart, all terms not defined herein shall have the meaning given them in the Clean Air Act or in subpart A of this part.