The oil pressed from the seed of a small Chinese tree of the Camellia family (C. oleifera). This commercial tea oil is said to equal olive oil in quality and is used in a similar manner.

This term describes substances present in oils and fats which are not glycerides and are resistant to saponification by strong alkali. Unsaponifiable matter is usually expressed as a percentage of the whole

If the free bonds in a fatty acid chain of carbon atoms are not all occupied by hydrogen atoms, the fatty acid is said to be unsaturated. Oils consisting mainly of the glycerides of unsaturated fatty acids are generally liquid at normal temperatures. (They may be made more solid by hydrogenation which reduces the degree of unsaturation).

Any of a wide variety of non-animal oils. Most vegetable oils--with the exception of coconut and palm oils--are lower in saturated fats than are animal-derived oils.

The property of an oil which determines its rate of flow. A "thick" oil is one with a high viscosity, whereas a "thin" oil is one with a low viscosity