Merriam-Webster Logo
SINCE 1828
Menu
×

An Encyclopædia Britannica Company

See What's Trending Now See More Trending Words

bolus

play
noun bo·lus \ ˈbō-ləs \

Definition of bolus

plural boluses
1 :a rounded mass: such as
a :a large pill
b :a soft mass of chewed food
2 medical
a :a dose of a substance (such as a drug) given intravenously
b :a large dose of a substance given by injection for the purpose of rapidly achieving the needed therapeutic concentration in the bloodstream

From the M-W Editors

young-plant-shoots
Merriam-Webster's New Words Quiz—Fall 2017 Edition!
video-title-words-of-the-year-1066
Words of the Year: 1066
image1644821030
These Are Fighting Words
alt-59c448f88ea38
Trending: Kim Jong Un: Trump a 'Dotard'

Origin and Etymology of bolus

Late Latin, from Greek bōlos lump

Other Pharmacology Terms

anodyne, cathartic, emetic, emollient, liniment, paregoric, poultice, purgative, soporific, spectrum

Medical Dictionary

bolus

play
noun bo·lus \ ˈbō-ləs \

medical Definition of bolus

plural boluses
1 :a rounded mass: as
a :a large pill
b :a soft mass of chewed food
2 a :a dose of a substance (as a drug) given intravenously
b :a large dose of a substance given by injection for the purpose of rapidly achieving the needed therapeutic concentration in the bloodstream
  • the patient receives a bolus dose to reach the minimum effective analgesic concentration
  • —J. F. Camp
  • subcutaneous injection of a premeal bolus of fast-acting insulin

Learn More about bolus

  1. See words that rhyme with bolus Nglish: Translation of bolus for Spanish speakers Britannica.com: Encyclopedia article about bolus

Seen and Heard

What made you want to look up bolus? Please tell us where you read or heard it (including the quote, if possible).

show hide

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

toothsome

play

agreeable, attractive, or delicious

Get Word of the Day daily email!

TRENDING NOW

  1. dotage, dotard a state or period of senile decay

  2. otherwise "in other respects"

  3. federalism Graham says bill gives power to states

  4. bodega "Don’t mess with the beloved bodega."

  5. carceral Of, relating to, or suggesting a jail or prison

SEE ALL

BROWSE DICTIONARY

bolus

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

alt-59c52d6ee2f72
Breathing Life Into 'Inspire'

The word's origins are quite literal

alt-59c4207ecf106
Let's Talk 'Tea'

Spill it, sip it: just make it hot.

image1644821030
8 Words and Phrases from Boxing and Wrestling

Common terms that come from boxing and wrestling

alt-59c2960017c94
The Ambiguity of Pushing 'Up' and 'Back'

When you push a meeting, where does it go?

Ask the Editors

video-title-words-of-the-year-1066
Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

payday
How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

video-irregardless-grammar-peeve-blend-of-the-synonyms-irrespective-and-regardless
Irregardless

It is in fact a real word (but that doesn't mean you should use it).

video-moose-goose-weird-plurals
Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

Word Games

young-plant-shoots
Merriam-Webster's New Words Quiz—Fall 2017 Edition!

You're going to have to memorize the dictionary again.

Take the quiz
stylized-drawing-of-woman-pole-vaulting-across-gap-to-get-trophy
Challenging Vocabulary Quiz Returns!

No tricks, just difficult words.

Take the quiz
True or False
True or False?

Test your knowledge - and maybe learn something along the way.

Take the quiz
Word Winder's CrossWinder
Word Winder's CrossWinder

A game of winding words.

Play the game