[boh-luh s]
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noun, plural bo·lus·es.
  1. Pharmacology, Veterinary Medicine. a round mass of medicinal material, larger than an ordinary pill. Abbreviation: bol.
  2. a soft, roundish mass or lump, especially of chewed food.
  3. bole2.

Origin of bolus

1595–1605; < Late Latin bōlus clod of earth < Greek bôlos clod, lump; see bole2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for bolus


noun plural -luses
  1. a small round soft mass, esp of chewed food
  2. an intravenous injection of a single dose of a drug over a short period
  3. obsolete a large pill or tablet used in veterinary and clinical medicine
  4. another word for bole 2

Word Origin for bolus

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

bolus in Medicine


n. pl. bo•lus•es
  1. A round mass.
  2. A single, relatively large dose of a drug that is administered for therapeutic purposes and taken orally.
  3. A concentrated mass of a pharmaceutical substance administered intravenously for therapeutic or diagnostic purposes.
  4. 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.