giar·​di·​a·​sis (ˌ)jē-ˌär-ˈdī-ə-səs How to pronounce giardiasis (audio)
plural giardiases (ˌ)jē-ˌär-ˈdī-ə-ˌsēz How to pronounce giardiasis (audio)
: infestation with or disease caused by a giardia

Examples of giardiasis in a Sentence

Recent Examples on the Web The 46-year-old was diagnosed with giardiasis, an intestinal infection, and was hospitalized for four days while doctors treated his symptoms, drew blood and performed a CT scan. Summer Lin, Los Angeles Times, 5 May 2023 Symptoms of giardiasis include abdominal cramps, vomiting, fever, and diarrhea. Discover Magazine, 29 June 2010 Research suggests that failure to adequately wash your hands between pooping and putting your hands in your mouth is likely the most common cause of giardiasis among campers. Wes Siler, Outside Online, 13 Aug. 2022 The giardia parasite causes the diarrheal disease giardiasis, per the Centers for Disease Control and Prevention (CDC). Korin Miller,, 15 June 2021 Larson herself had contracted a host of illnesses—dengue fever, hepatitis E, amoebiasis, giardiasis, eosinophilic meningitis, and cerebral malaria—and wanted to move closer to her father. Danielle Ofri, The New Yorker, 12 June 2021 Norovirus infections, which cause vomiting and diarrhea, were the second most common, with 1.3 million cases, followed by the diarrheal disease giardiasis with just over 400,000 annual cases. Sandee Lamotte, CNN, 16 Dec. 2020 One Wilderness Society staffer contracted giardiasis after drinking water running off a glacier. Keith McCafferty, Field & Stream, 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, 17 June 2017

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'giardiasis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


New Latin

First Known Use

1919, in the meaning defined above

Time Traveler
The first known use of giardiasis was in 1919

Dictionary Entries Near giardiasis

Cite this Entry

“Giardiasis.” Dictionary, Merriam-Webster, Accessed 12 Apr. 2024.

Medical Definition


plural giardiases -ˌsēz How to pronounce giardiasis (audio)
: 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

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