bolus

noun bo·lus \ ˈbō-ləs \
|Updated on: 21 Jun 2018
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

Recent Examples of bolus from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'bolus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of bolus

Late Latin, from Greek bōlos lump

Medical Dictionary

bolus

noun bo·lus \ ˈbō-ləs \
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


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).

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

a simultaneous discharge of guns

Get Word of the Day daily email!

Test Your Vocabulary

Test Your Emoji Exceptionalism

  • test-your-emoji-exceptionalism-written-with-a-lot-of-emoji
  • What is this emoji intended to represent: 🤳
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Bee Cubed

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!