order Polymastigina or·der·po·lymastigina uncommon noun 1. small usually parasitic flagellates SynonymsPolymastiginaorder Polymastigina Related words Broader terms animal order Parts Zoomastigina Part of polymastigotegenus Costiagenus GiardiaChilomastixHexamitagenus Trichomonas WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.