Lyginopteridales n 1: fossil gymnospermous trees or climbing plants from the Devonian: seed ferns [syn: {Cycadofilicales}, {order Cycadofilicales}, {Lyginopteridales}, {order Lyginopteridales}]
Lyginopteridales \Lyginopteridales\ n. An order of fossil gymnospermous trees or climbing plants from the Devonian: the seed ferns. Syn: Cycadofilicales, order {Cycadofilicales}, order {Lyginopteridales}. [WordNet 1.5]