Home›Browse›C›cryptosporidiumcryptosporidiumOur editors are putting together more complete content — check back in about 20 minutescryptosporidiumcryptosporidium — nounnoun1. a microscopic parasite that causes diarrhea in humans and animals1.nounDefinitiona microscopic parasite that causes diarrhea in humans and animalsExampleCryptosporidium is often found in contaminated water.