cordaitales

from The Century Dictionary.

• An order of fossil gymnospermous plants, usually made to include the families Cordaitaceæ and Dolerophyllaceæ: doubts, however, exist with regard to the latter.

from the GNU version of the Collaborative International Dictionary of English.

• noun an order of extinct plants having tall arborescent trunks comparable to or more advanced than cycads; known from the Pennsylvanian; probably extinct since the Mesozoic.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun extinct plants having tall arborescent trunks comparable to or more advanced than cycads; known from the Pennsylvanian period; probably extinct since the Mesozoic era