giardia UK /d͡ʒiˈɑːdɪə/US /d͡ʒiˈɑɹdiə/ noun2 •The human intestinal parasite Giardia lamblia.As soon as the immune system has generated antibodies against one coat, giardia switches to another. — 2008 •Giardiasis, the disease caused by the parasite.
