The Collaborative International Dictionary of English v.0.48:
Marattiales \Marattiales\ prop. n. An order of lower ferns coextensive with the family Marattiaceae. Syn: order Marattiales. [WordNet 1.5]WordNet (r) 3.0 (2006):
Marattiales n 1: lower ferns coextensive with the family Marattiaceae [syn: Marattiales, order Marattiales]