| barium meal | Oral administration of barium sulfate suspension for radiographic study of the upper gastrointestinal tract (British usage). (05 Mar 2000) |
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| meal | 1. Grain (especially. Maize, rye, or oats) that is coarsely ground and unbolted; also, a kind of flour made from beans, pease, etc.; sometimes, any flour, esp. If coarse. 2. Any substance that is coarsely pulverized like meal, but not granulated. Meal beetle, the larva of a beetle (Tenebrio molitor) which infests granaries, bakehouses, etc, and is very injurious to flour and meal. Origin: OE. Mele, AS. Melu, melo; akin to D. Meel, G. Mehl, OHG. Melo, Icel. Mjol, SW. Mjol, Dan. Meel, also to D. Malen to grind, G. Mahlen, OHG, OS, & Goth. Malan, Icel. Mala, W. Malu, L. Molere, Gr. Mill, and E. Mill. Cf. Mill, Mold soil, Mole an animal, Immolate, Molar. The portion of food taken at a particular time for the satisfaction of appetite; the quantity usually taken at one time with the purpose of satisfying hunger; a repast; the ac or time of eating a meal; as, the traveler has not eaten a good meal for a week; there was silence during the meal. "What strange fish Hath made his meal on thee ?" (Shak) Origin: OE. Mel; akin to E. Meal a part, and to D. Maal time, meal, G. Mal time, mahl meal, Icel. Mal measure, time, meal, Goth. Ml time, and to E. Measure. See Measure. Source: Websters Dictionary (01 Mar 1998) |
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| meal worm | The larva of beetles of the genus Tenebrio; both larvae and adults are important pests, destroying flour, meal, and other cereal products; they are also intermediate hosts of nematodes of the genus Gongylonema, and of various tapeworms of the genus Hymenolepis. (05 Mar 2000) |
| test meal | Toast and tea, or crackers and tea, or gruel or other bland food, given to stimulate gastric secretion before withdrawing gastric contents for analysis, administration of food containing a substance thought to be responsible for symptoms, such as an allergic reaction. (05 Mar 2000) |
| air contrast barium enema | A double contrast enema in which air is introduced after coating of the colon with a dense barium suspension for radiographic study. Synonym: air contrast barium enema. (05 Mar 2000) |
| barium | <chemistry> One of the elements, belonging to the alkaline earth group; a metal having a silver-white colour, and melting at a very high temperature. It is difficult to obtain the pure metal, from the facility with which it becomes oxidized in the air. Symbol, Ba. Its oxide called baryta. [Rarely written barytum. Some of the compounds of this element are remarkable for their high specific gravity, as the sulphate, called heavy spar, and the like. The oxide was called barote, by Guyton de Morveau, which name was changed by Lavoisier to baryta, whence the name of the metal. Origin: NL, fr. Gr. Barys heavy. Source: Websters Dictionary (01 Mar 1998) |
| barium chloride | Formerly used as a heart tonic and for varicose veins; extremely toxic. (05 Mar 2000) |
| barium compounds | Inorganic compounds that contain barium as an integral part of the molecule. (12 Dec 1998) |
| barium contrast material | This radiopaque contrast material is either swallowed or given as a enema for the purpose of demonstrating the anatomy of the gastrointestinal tract using X-rays. (27 Sep 1997) |
| barium enema | A radiographic diagnostic procedure that involves the introduction of a barium containing contrast material into the lower gastrointestinal tract via the anus. X-rays taken after instillation of the barium will outline the course and anatomy of the lower GI tract. (27 Sep 1997) |
| barium hydroxide | Ba(OH)2;a caustic compound combined with calcium hydroxide in a carbon dioxide absorbent; used in anaesthetic circuits. See: absorbent. (05 Mar 2000) |
| barium oxide | BaO;it is caustic, forming the strong base, Ba(OH)2, in water; used as a dehydrating agent. Synonym: baryta. (05 Mar 2000) |
| barium radioisotopes | Unstable isotopes of barium that decay or disintegrate emitting radiation. Ba atoms with atomic weights 126-129, 131, 133, and 139-143 are radioactive barium isotopes. (12 Dec 1998) |
| barium solution | A liquid containing barium sulfate, which shows up on X-rays. It outlines organs of the body so they can be seen on X-ray film. (12 Dec 1998) |
| barium sulfate | <chemical> Sulfuric acid, barium salt (1:1). A compound used as an X-ray contrast medium that occurs in nature as the mineral barite. It is also used in various manufacturing applications and mixed into heavy concrete to serve as a radiation shield. Pharmacological action: contrast media. Chemical name: Sulfuric acid, barium salt (1:1) (12 Dec 1998) |
| barium sulfide | A poisonous grayish yellow powder, used as a depilatory. (05 Mar 2000) |