gum

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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;
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, 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.
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, asafetida, bdelliumbdellium
, aromatic gum resin obtained from trees of the genus Commiphora, or Balsamodendron, of the incense-tree family. It is similar to myrrh. Bdellium is used in medicines and perfumes.
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, gambogegamboge
[Fr.,=Cambodia], an intensely yellow pigment obtained from the sap of Garcinia morella, a tree of SE Asia and Sri Lanka.
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, 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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.

Bibliography

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).

gum

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

gum

[gəm]
(materials)
A hydrophilic plant polysaccharide or derivative that swells to produce a viscous dispersion or solution when added to water. Also known as hydrocolloid.
(petroleum engineering)
Any one of the partially oxidized high-molecular-weight hydrocarbons that can form in gasoline stored without the addition of an oxidation inhibitor.

gum

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.

gum

1
any sticky substance used as an adhesive; mucilage; glue

gum

1
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

gum

2
the fleshy tissue that covers the jawbones around the bases of the teeth
References in periodicals archive ?
So far, the Gumdrops have been installed at private companies, including Legoland, BAA, Royal Mail, Amey, ISS and Westfield Shopping Centres, as well as in towns and cities as part of council schemes to reduce chewing gum litter, including one in Bangor, North Wales.
A spokeswoman for the authority said: "The Gumdrop bins in Cardiff have only been in use for one week and many of them are not yet fully installed.
GUMDROP CAKE 1/2 cup solid shortening 1 cup sugar 2 eggs 2 1/2 cups unsifted all-purpose flour 3/4 teaspoon salt, or to taste 2 teaspoons baking powder 1/2 pound lemon- and orange-flavored gumdrops, 1/2-inch size 1/2 cup golden or dark raisins or currants 1/2 teaspoon vanilla extract 3/4 cup milk [1] Heat oven to 300[degrees]F.
Candies suited for decorations (whole or cut in pieces) include orange, green, or red gumdrops, black licorice sticks or thin black licorice whips (or strings), small colored candies, miniature chocolate chips, and colored sugars.
The Dragon, a recyclable and gumdrop shaped capsule, was the first to reach the space station in 2012.
Officials yesterday began installing the bright pink Gumdrop bins at 80 sites in the centre of Cardiff and 20 more throughout the rest of the city.
During this dark night of what passes for his soul, Ray is next visited by his kid brother Warren, a bent cop with a bad case of the drug-fidgets, who approves of the gumdrop gambit--in part because he's got his own creepy thing going with his neighbor's 14-year-old daughter.
Trade Am's new Anthropology Collection is available in several cheery and bright colorways: sunlight, seashore, gumdrop and orchid.
Indeed, to see a gumdrop tent in this wide-open landscape is to see a barnacle on the back of a blue whale.
Dominique Mercy inquires repeatedly of audience members as he whistles and wheezes, or when Metchild Grossman turns Japanese and rhapsodizes over the pronunciation of words such as "sushi" and "samurai," wrapping her lips around each word as if it were a verbal gumdrop.
Squeeze bag to pipe stripes on each gumdrop body to resemble bumblebee.