The Collaborative International Dictionary of English v.0.48:
Cycadales \Cycadales\ n. an order of primitive tropical gymnosperms abundant in the Mesozoic, now reduced to a few scattered tropical forms. Syn: order Cycadales. [WordNet 1.5]WordNet (r) 3.0 (2006):
Cycadales n 1: primitive tropical gymnosperms abundant in the Mesozoic, now reduced to a few scattered tropical forms [syn: Cycadales, order Cycadales]