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Medical Definition of Zoomastigophora
1. A class of protozoa consisting of animal-like flagellates. Its organisms are heterotrophic and have one-to-many flagella. This class includes one superorder, parabasalidea, and six orders: choanoflagellida, kinetoplastida, proteromonadida, retortamonadida, diplomonadida, and oxymonadida. (12 Dec 1998)