Dictionary.com
definitions

oleo oil

noun
  1. a product obtained from beef fat and consisting chiefly of a mixture of olein and palmitin, used for making butterlike foods.

Origin of oleo oil

An Americanism dating back to 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for oleo oil

oleo oil

noun
  1. an oil extracted from beef fat, consisting mainly of a mixture of olein and palmitin. It is used in the manufacture of margarine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012