[ jee-ahr-dahy-uh-sis, jahr- ]

  1. an intestinal disorder characterized by abdominal discomfort and prolonged, intermittent diarrhea, caused by the protozoan Giardia lamblia and contracted by drinking untreated water, as of streams or ponds, contaminated with the feces of infected animals.

Origin of giardiasis

First recorded in 1915–20; see origin at giardia, -asis
  • Also called beaver fever.

Words Nearby giardiasis Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

British Dictionary definitions for giardiasis


/ (ˌdʒaɪɑːˈdaɪəsɪs) /

  1. infection with the parasitic protozoan Giardia lamblia, which can cause severe diarrhoea

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for giardiasis


[ jē′är-dīə-sĭs ]

  1. An intestinal infection caused by the protozoan Giardia lamblia. It is usually asymptomatic in humans but can cause diarrhea, nausea, and abdominal cramping. Giardiasis is most commonly transmitted by contaminated water and by direct contact among individuals in group settings.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.