Isoetales isoe·ta·les uncommon noun 1. aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales Synonymsorder Isoetales Related words Broader terms plant order Parts Lycopsida Part of Isoetaceae WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
