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gum,in anatomy: see teethteeth,
hard, calcified structures embedded in the bone of the jaws of vertebrates that perform the primary function of mastication. Humans and most other mammals have a temporary set of teeth, the deciduous, or milk, teeth; in humans, they usually erupt between the 6th and 24th
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gum,term commonly applied to any of a wide variety of colloidal substances somewhat similar in appearance and general characteristics, exuded by or extracted from plants. In this classification, however, many substances that are not true gums are included, among them many resinsresin,
any of a class of amorphous solids or semisolids. Resins are found in nature and are chiefly of vegetable origin. They are typically light yellow to dark brown in color; tasteless; odorless or faintly aromatic; translucent or transparent; brittle, fracturing like glass;
..... Click the link for more information. , so-called gum resins, and such substances as frankincense, myrrh, labdanum, copal, amber, chicle, and rubber (gum elastic, India rubber). True gums are complex organic substances mostly obtained from plants, some of which are soluble in water and others of which, although insoluble in water, swell up by absorbing large quantities of it. With water they form thick, gluey fluids. Their chemical nature is complex. In general, they contain in various proportions carbon, hydrogen, oxygen, and such metals as calcium, magnesium, and potassium in the form of salts of various organic acids. Gum arabic, or gum acacia, is a typical, water-soluble gum obtained from various plants of the genus Acacia, chiefly those found in Africa. A complex polysaccharide containing metal salts, gum arabic varies in color from white to red and is used extensively in making inks, adhesives, and confections; in the textile industry for filling fabrics; and in medicine as an emollient. Gum senegal is very similar. Among the gum resins (mixtures of gums and resins) are ammoniacammoniac
or gum ammoniac
, yellowish substance with a sickening, bitter taste, obtained from the milky exudate of the injured stem of a plant (Dorema ammoniacum) found in Iran, India, and S Siberia. It is a gum resin, soluble in alcohol and ether.
..... Click the link for more information. , asafetida, bdelliumbdellium
, aromatic gum resin obtained from trees of the genus Commiphora (Balsamodendron of the incense-tree family). It is similar to myrrh. Bdellium is used in medicines and perfumes.
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[Fr.,=Cambodia], an intensely yellow pigment obtained from the sap of Garcinia morella, a tree of SE Asia and Sri Lanka.
..... Click the link for more information. , and myrrh. See also tragacanthtragacanth
or gum tragacanth,
gummy exudation from the leguminous shrub Astragalus gummifer and related pulse family plants of SE Europe and W Asia. It is obtained through incisions in the stem of the plant. The gum is produced chiefly in Iran.
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See C. L. Mantell et al., The Technology of Natural Resins (1942); C. L. Mantell, The Water-Soluble Gums (1947, repr. 1965); R. L. Davidson, Handbook of Water-Soluble Gums and Resins (1980).
A moderately high-density hardwood, whitish to gray-green in color and of uniform texture; used for low-grade veneer, plywood, and rough cabinet work. See also: Douglas fir
A hydrophilic plant polysaccharide or derivative that swells to produce a viscous dispersion or solution when added to water. Also known as hydrocolloid.
Any one of the partially oxidized high-molecular-weight hydrocarbons that can form in gasoline stored without the addition of an oxidation inhibitor.
1. A moderately high-density hardwood of the eastern and southern US; whitish to gray-green in color and of uniform texture; used for low-grade veneer, plywood, and rough cabinet work.
2. Any of a class of colloidal substances that are soluble or swell in water, exuded by or prepared from plants; sticky when moist.
any sticky substance used as an adhesive; mucilage; glue
1. any of various sticky substances that exude from certain plants, hardening on exposure to air and dissolving or forming viscous masses in water
2. any of various products, such as adhesives, that are made from such exudates
3. NZ short for kauri gum
the fleshy tissue that covers the jawbones around the bases of the teeth