What is "mastigophora"

Mastigophora \Mas"ti*go*phor`a\, prop. n. [NL., fr. Gr. ma`stix, ma`stigos, a whip + fe`rein to bear.] (Zo["o]l.) A phylum of protozoans the kingdom Protista, consisting mainly of free-living flagellated unicellular organisms, lacking photosynthetic capability. Some members are pathogenic in man.