Anguilliformes an·guil·li·formes uncommon noun 1. elongate fishes with pelvic fins and girdle absent or reduced Synonymsorder Anguilliformesorder Apodes Related words Broader terms animal order Parts Malacopterygii Part of eelAnguillidaeMuraenidaeCongridae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.