World English Dictionary
cryptosporidium (ˌkrɪptəʊspɔːˈrɪdɪəm)
 
n
any parasitic sporozoan protozoan of the genus Cryptosporidium, species of which are parasites of birds and animals and can be transmitted to humans, causing severe abdominal pain and diarrhoea (cryptosporidiosis)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

Cryptosporidium Cryp·to·spo·rid·i·um (krĭp'tō-spô-rĭd'ē-əm)
n.
A genus of parasitic coccidian protozoans that infect the epithelial cells of the gastrointestinal tract in vertebrates and flourish in humans under conditions of intense immunosuppression.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for cryptosporidium
Note that cryptosporidium typically does not cause serious illness in healthy people.
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