giar·​di·​a·​sis | \ (ˌ)jē-ˌär-ˈdī-ə-səs How to pronounce giardiasis (audio) , jē-ər-, jär- \
plural giardiases\ (ˌ)jē-​ˌär-​ˈdī-​ə-​ˌsēz How to pronounce giardiases (audio) , jē-​ər-​ , jär-​ \

Definition of giardiasis

: infestation with or disease caused by a giardia

Examples of giardiasis in a Sentence

Recent Examples on the Web One Wilderness Society staffer contracted giardiasis after drinking water running off a glacier. Keith Mccafferty, Field & Stream, "The Ultimate Survival Guide to Finding and Purifying Water," 19 June 2020 Through his research and his work with diplomats and other international travelers, Dr. Wolfe became an authority on such exotic conditions as giardiasis and schistosomiasis, both of which are caused by parasites. Matt Schudel, Washington Post, "Martin Wolfe, doctor specializing in tropical and travel medicine, dies at 82," 17 June 2017

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

First Known Use of giardiasis

1919, in the meaning defined above

History and Etymology for giardiasis

New Latin

Keep scrolling for more

Learn More about giardiasis

Time Traveler for giardiasis

Time Traveler

The first known use of giardiasis was in 1919

See more words from the same year

Statistics for giardiasis

Last Updated

28 Jun 2020

Cite this Entry

“Giardiasis.” Dictionary, Merriam-Webster, Accessed 7 Jul. 2020.

Keep scrolling for more

More Definitions for giardiasis


giar·​di·​a·​sis | \ (ˌ)jē-ˌär-ˈdī-ə-səs, ˌjē-ər-, jär- How to pronounce giardiasis (audio) \
plural giardiases\ -​ˌsēz How to pronounce giardiases (audio) \

Medical Definition of giardiasis

: infestation with or disease caused by a flagellate protozoan of the genus Giardia (especially G. lamblia) that is often characterized by diarrhea

called also lambliasis

More from Merriam-Webster on giardiasis Encyclopedia article about giardiasis

Comments on giardiasis

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


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

A More Exception(al) Quiz

  • hot dog  hot dog  hot dog  hot dog cat
  • Which of the following words is not a synonym for ‘a young person’?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

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

Love words? Need even more definitions?

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