1. A parasitic protozoan that infects the small intestine and causes severe diarrhea and digestive problems in humans and animals.
Usage: Medical/scientific term; Often used in the context of waterborne illness

Examples

• The hiker contracted giardia from drinking untreated water from the mountain stream.
• Giardia is one of the most common parasitic infections in the United States.
• Symptoms of giardia include severe cramping, bloating, and watery diarrhea.
• The water treatment facility tests for giardia and other harmful pathogens.
• Travelers to developing countries should be cautious about giardia contamination in local water supplies.
• Giardia can be transmitted through contaminated food as well as water.