The infectious stage of Giardia intestinalis and certain other protozoan parasites that have protective walls that facilitate their survival in water and other environments
a closed sac or pouch with a definite wall,that contains fluid, semifluid, or solid material
A pouch or sac without opening, usually membranous and containing morbid matter, which develops in one of the natural cavities or in the substance of an organ
A pouch or sac without opening, usually membranous and containing morbid matter, which is accidentally developed in one of the natural cavities or in the substance of an organ