A-C |  D-F  |  G-L  |  M-O  |  P-S  |  T-W   T Tallow The harder and less fusible fat in animals and vegetables. Teaseed Oil 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.   U Unsaponifiable Matter 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. Unsaturated 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).   V Vegetable Oil 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. Viscosity 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.   W Walnut Oil This expensive oil is pressed from walnuts and has a distinctive nutty flavor and fragrance. Used in salad dressings, sauces, baked goods, and for sautéing. Waxes Waxes are esters formed by the combination of fatty acids with high molecular weight alcohols. In most cases, waxes are hard, brittle substances with high melting points. A notable exception is Sperm Oil which is a liquid obtained from the head cavity of the Sperm Whale. Winterisation A type of fractionation in which liquid oils are cooled in order to precipitate any solid constituents (stearine) which may then be removed by filtration, the filtrate being known as a winterised oil. These oils are used mainly for culinary purposes where the appearance of solids from the unwinterised oil in cold weather would lead to undesirable cloudiness.

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