oil

n.

1. Liquid, greasy substance

   melted fat, unction, lubricant; see fat, grease.

   Common oils include: vegetable, animal, mineral, fixed, fatty, volatile, essential, machine, crude, lubricating, cottonseed, olive, canola, coconut, sunflower, peanut, safflower, castor, palm, corn, whale, sperm, linseed, drying, semidrying, nondrying, polyunsaturated, monounsaturated, wormwood, candlenut, poppy-seed, soybean, sesame, cinnamon-bark, tung, cassia, vetiver, bergamot, wintergreen, cameline, palmarosa, chenopodium, ilang-ilang, cod-liver, halibut-liver, hake, fish; petroleum, kerosene, lard, tallow, oleo, oil of amber, oil of spike lavender, lanolin, turpentine.

2. Liquid substance used for power or illumination

   petroleum, kerosene, coal oil, crude oil, liquid coal, rock oil, fossil fuel, fossil oil, cerate, liquid gold*; see also fuel, petroleum.

oil

v.