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[boh-luh s] /ˈboʊ ləs/
noun, plural boluses.
Pharmacology, Veterinary Medicine. a round mass of medicinal material, larger than an ordinary pill.
Abbreviation: bol.
a soft, roundish mass or lump, especially of chewed food.
bole2 .
Origin of bolus
1595-1605; < Late Latin bōlus clod of earth < Greek bôlos clod, lump; see bole2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for bolus


noun (pl) -luses
a small round soft mass, esp of chewed food
an intravenous injection of a single dose of a drug over a short period
(obsolete) a large pill or tablet used in veterinary and clinical medicine
another word for bole2
Word Origin
C17: from New Latin, from Greek bōlos clod, lump
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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bolus in Medicine

bolus bo·lus (bō'ləs)
n. pl. bo·lus·es

  1. A round mass.

  2. A round medicinal preparation, such as a large pill or tablet, that is usually of a soft consistency and not prepackaged.

  3. A soft mass of chewed food within the mouth or alimentary canal.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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