[ boh-luh s ]
/ ˈboʊ ləs /

noun, plural bo·lus·es.

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.



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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. 2020

Example sentences from the Web for bolus

British Dictionary definitions for bolus

/ (ˈbəʊləs) /

noun plural -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 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

Medical definitions for bolus

[ bōləs ]

n. pl. bo•lus•es

A round mass.
A single, relatively large dose of a drug that is administered for therapeutic purposes and taken orally.
A concentrated mass of a pharmaceutical substance administered intravenously for therapeutic or diagnostic purposes.
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.