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Definition of Cytostome
1. Noun. Mouth of a protozoan.
Medical Definition of Cytostome
1. The cell "mouth" of certain complex protozoa, usually with a short gullet or cytopharynx leading food into the organism, where it is collected into food vacuoles, then circulated inside the body, eventually to be excreted through the cytopyge. Origin: cyto-+ G. Stoma, mouth (05 Mar 2000)