Tanned principally by oil and heat: a process applied to sheepskins and lambskins.
The Century Dictionary (Public Domain)
Use "oil-tanned" in a sentence
"Then I can boil my belt and oil-tanned moccasins and a pair of cowhide mittens."
"They are brothers to the moccasin, and are made of oil-tanned cowhide, with flexible soles."
"There in a row hang fifty pair of smoke-tanned moccasins; in another an equal number of oil-tanned; across the background you can make out snowshoes."