Gagging - Contraction of the constrictor muscle of the pharynx elicited by stimulation of sensory receptors on the soft palate, by psychic stimuli, or systemically by drugs.

Giardiasis - An infection of the small intestine caused by the flagellated protozoan Giardia lamblia. It is spread via contaminated food and water and by direct person-to-person contact. 

Coccidiosis - Protozoan infection found in animals and man. It is caused by several different genera of coccidia.

Villous - Pubescent, shaggy, covered with fine long hairs, but the hairs not matted.