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 ?
In some cases, a patient may undergo denture adjustment, deep cleaning or drainage to remove gum boils.
Guar gum is regarded as a novel agrochemical, which makes it ideal for use in food processing applications.
Hence, the gum Arabic belt will continue to be the main stable factor for supply of potable water and a place for food security and a strategic location for food security to Arab and African countries.
Sudan targets to become a regional center for trade and researches of Gum Arabic in Africa, while" UNCAD"'s viewpoint that Sudan capable to reply needs of all member states in the organization to Gum Arabic.
Whether gum disease is an independent risk factor for heart disease is still being discussed, but there are some theories as to how the two might be related.
"One of the common perceptions among the people to fight halitosis is to use chewing gum. Though chewing gum causes more salivation initially thereby diluting the bad breath, the effect is lost after a few minutes.
It was a small, round bin where people could deposit chewed gum.
The study on microwave-assisted synthesis of modified guar gum is rarely reported.
Research demonstrates that sugar-free gum, specifically, is actually good for your teeth, because it can prevent decay and plaque formation.
Gum arabic is a resin that is used as an emulsifier in sodas, a thickener in candies, a binder in some inks and drugs, and as even a foam stabilizer in beer.
Higher preference to naturally-derived gum arabic in F&B industry