WordNet (r) 3.0 (2006):

oleo
    n 1: a spread made chiefly from vegetable oils and used as a
         substitute for butter [syn: margarine, margarin,
         oleo, oleomargarine, marge]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "oleo":
   butter, buttermilk, certified milk, cheese, condensed milk, cream,
   dairy products, ghee, half-and-half, heavy cream, light cream,
   margarine, milk, nonfat dry milk, oleomargarine, raw milk,
   skim milk, sour cream, whey, whipping cream, yogurt



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

OLEO
       Open Linking and Embedding of Objects (OLE, OpenDoc)