1) The gullet of a protozoan 
An organelle in certain flagellates and ciliates that serves as a gullet through which food material passes from the cytostome to the cell interior; food passed is collected in food vacuoles, into which digestive enzymes are secreted. ... (05 Mar 2000) ... 
Type: Term Pronunciation: sī′tō-far′inks Definitions: 1. An organelle in certain flagellates and ciliates that serves as a gullet through which food material passes from the cytostome to the cell interior; food passed is collected in food vacuoles, into which digestive enzymes are secreted.
Part of the food ingestion structures (mouth) of some cells; usually a channel of microtubules that draws newly formed food vacuoles away from the cytostome and into the cell. 
the gullet of a protozoan.