Malacopterygii ma·la·cop·terygii uncommon noun 1. an extensive group of teleost fishes having fins supported by flexible cartilaginous rays Synonymssuperorder Malacopterygii Related words Broader terms animal order Parts Teleostei Part of soft-finned fishCypriniformesSiluriformesGadiformesAnacanthiniAnguilliformesIsospondyliSynodontidae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.