bolus
[bo´lus] 1. a rounded mass of food or pharmaceutical preparation ready to be swallowed, or such a mass passing through the gastrointestinal tract.
2. a concentrated mass of pharmaceutical preparation, e.g., an opaque contrast medium, given intravenously or swallowed.
3. a mass of scattering material, such as wax or paraffin, placed between the radiation source and the skin to achieve a precalculated isodose pattern in the tissue irradiated.
alimentary bolus the mass of food, made ready by mastication, that enters the esophagus at one swallow.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
bo·lus (bol),
(bō'lŭs), 1. A single, relatively large quantity of a substance, usually one intended for therapeutic use, such as a bolus dose of a drug injected intravenously.
2. A masticated morsel of food or another substance ready to be swallowed, such as a bolus of barium for radiographic studies.
3. In high-energy radiation therapy, a quantity of tissue-equivalent material placed in the radiation beam, over the surface of the irradiated region, to increase the absorbed dose in the superficial tissues.
[L. fr. G. bōlos, lump, clod]
Farlex Partner Medical Dictionary © Farlex 2012
bolus
(1) Any concentrate given as a single dose to achieve an immediate effect.
(2) Any mass or globule—e.g., masticated food—in transit through a tube.
Endocrinology
An extra boost of insulin given to cover expected rise in blood glucose (sugar) such as the rise that occurs after eating.
Therapeutics
A large IV dose of a drug given all at once at the beginning of treatment, which raises the concentration in the body to a therapeutic level. In treating malignancy, prolonged IV infusions may be more effective than intermittent bolus injections.
Vox populi
A popular term for a hyperinfusion of information—e.g., “crash” review courses before boards exams.Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
bolus
1. Any concentrate given as a single dose to achieve an immediate effect.
2. Any mass or blob–eg, masticated food, in transit through a tube Endocrinology An extra boost of insulin given to cover expected rise in blood glucose–sugar such as the rise that occurs after eating Therapeutics A large IV dose of a drug given “all at once” at the beginning of treatment, which raises the concentration in the body to a therapeutic level.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
bo·lus
(bō'lŭs) 1. A single, relatively large quantity of a substance, usually one intended for therapeutic use (e.g., bolus dose of an intravenously injected drug) generally followed by smaller doses.
2. A masticated morsel of food or another substance ready to be swallowed (e.g., a bolus of barium for x-ray studies).
3. In high-energy radiation therapy, a quantity of tissue-equivalent material placed next to the irradiated region to increase the dose of secondary radiation to the superficial tissues.
[L. fr. G. bōlos, lump, clod]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
bolus
1. A chewed-up quantity of food in a state ready to be swallowed.
2. The dose of a drug injected as rapidly a possible into a vein so as to be diluted as little as possible.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
bolus
a soft mass of chewed food, suitable for swallowing, shaped by the tongue in the BUCCAL cavityCollins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
bo·lus
(bō'lŭs) 1. A single, relatively large quantity of a substance, usually one intended for therapeutic use (e.g., dose of an intravenous drug).
2. A masticated morsel of food or another substance ready to be swallowed.
[L. fr. G. bōlos, lump, clod]
Medical Dictionary for the Dental Professions © Farlex 2012