Noun | 1. | Myxinoidei - hagfishes as distinguished from lampreys Hyperotreta, Myxiniformes, Myxinoidea, suborder Hyperotreta, suborder Myxiniformes, suborder Myxinoidei animal order - the order of animals Cyclostomata, order Cyclostomata - primitive jawless aquatic vertebrate: lampreys; hagfishes |