giardia
noun
giar·dia
jē-ˈär-dē-ə 
ˈjär-
ˈjär-
: any of a genus (Giardia) of flagellate protozoans inhabiting the intestines of various mammals and including one (G. lamblia synonym G. intestinalis) that is associated with diarrhea in humans
Examples of giardia in a Sentence
Recent Examples on the Web
Parasitic colitis is caused by parasitic organisms associated with cryptosporidium, amoeba or giardia.
—
Daryl Austin, USA Today, 5 June 2025
Secondary lactase deficiency can happen after an infection with rotavirus or giardia.
—Amber J. Tresca, Verywell Health, 14 Mar. 2025
Puppies had infections and diseases such as giardia, hookworm and parvovirus, Glass said.
—Joe Marusak, Charlotte Observer, 5 Mar. 2025
The lab will test your stool for signs of giardia (a parasite) or bacteria like C. diff.1
Colonoscopy
A colonoscopy is a test that allows providers to see the inside of the large intestine.
—Mark Gurarie, Health, 12 Feb. 2025
Blood testing and stool testing is often also suggested, Chey adds, in order to rule out other causes for symptoms such as inflammation associated with conditions such as celiac disease or chronic infections like giardia.
—Daryl Austin, USA TODAY, 1 Feb. 2025
In addition to risks of hookworms and roundworms, pets are also vulnerable to whipworm, giardia and coccidia.
—Julia Wuerz, The Conversation, 6 Feb. 2024
Kline says anyone exposed to untreated water might expect risks similar to those that campers might face in rivers or lakes, which include parasites like giardia.
—Alice Park, TIME, 25 July 2024
These diseases include bacterial infections like campylobacter and salmonella and parasitic infections like cryptosporidium, giardia and tapeworm.
Symptoms can include abdominal cramping, diarrhea, fever and vomiting.
—Katia Hetter, CNN, 29 Feb. 2024
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Daryl Austin, USA Today, 5 June 2025
Secondary lactase deficiency can happen after an infection with rotavirus or giardia.
—Amber J. Tresca, Verywell Health, 14 Mar. 2025
Puppies had infections and diseases such as giardia, hookworm and parvovirus, Glass said.
—Joe Marusak, Charlotte Observer, 5 Mar. 2025
The lab will test your stool for signs of giardia (a parasite) or bacteria like C. diff.1
Colonoscopy
A colonoscopy is a test that allows providers to see the inside of the large intestine.
—Mark Gurarie, Health, 12 Feb. 2025
Blood testing and stool testing is often also suggested, Chey adds, in order to rule out other causes for symptoms such as inflammation associated with conditions such as celiac disease or chronic infections like giardia.
—Daryl Austin, USA TODAY, 1 Feb. 2025
In addition to risks of hookworms and roundworms, pets are also vulnerable to whipworm, giardia and coccidia.
—Julia Wuerz, The Conversation, 6 Feb. 2024
Kline says anyone exposed to untreated water might expect risks similar to those that campers might face in rivers or lakes, which include parasites like giardia.
—Alice Park, TIME, 25 July 2024
These diseases include bacterial infections like campylobacter and salmonella and parasitic infections like cryptosporidium, giardia and tapeworm.
Symptoms can include abdominal cramping, diarrhea, fever and vomiting.
—Katia Hetter, CNN, 29 Feb. 2024
Cite this Entry
“Giardia.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/giardia. Accessed 16 Jul. 2025.
Copy CitationMedical Definition
giardia
noun
giar·dia
jē-ˈär-dē-ə
ˈjär-
ˈjär-
1
capitalized
: a genus of flagellate protozoans inhabiting the intestines of various mammals and including one (G. lamblia synonym G. intestinalis) that is associated with diarrhea in humans
2
: any flagellate of the genus Giardia
Love words? Need even more definitions?
Merriam-Webster unabridged
Share