Dictionary.net

[Greek] A genus of microscopic animals (Flagellata). C. hominis, parasitic in man, is said to cause diarrhoea and other symptoms. C. intestinalis, frequent in the human intestine, is non-pathogenic.

A genus of the Mastigophora and the order Protomonadina, having a long or an oval body, sharp-pointed at one end and provided with one flagellum at the pointed end.