jēˈärdēə, ˈjär- noun
Etymology: New Latin, from Alfred M. Giard died 1908 French biologist + New Latin -ia
1. capitalized : a genus of zooflagellates inhabiting the intestines of various mammals and including a species ( Giardia lamblia syn. Lamblia intestinalis ) that is associated with but not demonstrably the cause of diarrhea in man
2. -s : any flagellate of the genus Giardia