gum


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Idioms, Wikipedia.

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
..... Click the link for more information.
.

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, or Balsamodendron, of the incense-tree family. It is similar to myrrh. Bdellium is used in medicines and perfumes.
..... Click the link for more information.
, gambogegamboge
[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.
..... Click the link for more information.
.

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 ?
Consumption of gum arabic has increased owing to its high dietary fiber content which aids in healthy digestion and bowel movement.
LGA environment spokeswoman Judith Blake said: "Chewing gum is a plague on our pavements.
With flavors like strawberry, watermelon, blueberry and tropical twist, this chewing gum can be way more than a breath freshener.
Watch out for the early warning signs like bleeding gums along with persistent bad breath, toothache, and receding gums.
The most well-known, widely distributed sugar-free gums often contain several sugar alcohols in addition to artificial sweeteners.
Over-innovation, too many new launches have left consumers somewhat dazed and confused when it comes to gum buying.
bolstered its gum selection last summer with a series of product introductions.
Since gum disease often goes unnoticed, it's important to understand the warning signs.
When looking at how c-stores compare to other retail channels, more than 62 percent of respondents in this age group reported buying candy or gum in a c-store.
A Kirklees spokesman said: "There are plenty of litter bins in the town centre and people should use these to dispose of their gum or wrap it and take it home with them.
Writer Roald Dahl, who is associated with Cardiff, had Willy Wonka himself saying: "Chewing gum is really gross, chewing gum I hate the most", he said.
The gums will eventually become inflamed and recede, exposing the roots of the teeth.