The word "oleol" is spelled with five letters: o-l-e-o-l. It is pronounced /oʊliəl/ with the first syllable stressed. The "oe" sounds like the "o" in "go" and the "e" in "pet". The second syllable has a short "i" sound like the "i" in "sit". The last syllable is pronounced with an "əl" sound like the word "diesel". The word oleol is not widely used, but it refers to an oily liquid that is used in the manufacturing of synthetic oils and lubricants.
Oleum infusum.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.