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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 .
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 boluses


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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boluses 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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Encyclopedia Article for boluses


food that has been chewed and mixed in the mouth with saliva. Chewing helps to reduce food particles to a size readily swallowed; saliva adds digestive enzymes, water, and mucus that help chemically to reduce food particles, hydrate them for taste, and lubricate them for easy swallowing. The term bolus applies to this mixture of food and solutions until they are passed into the stomach. Once the bolus reaches the stomach, mixes with gastric juices, and becomes reduced in size, the food mass becomes known as chyme.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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