from The Century Dictionary.

  • An order of monocotyledonous plants, consisting of aquatic or marsh herbs with unisexual flowers, the parts of which are usually unequal in number. It embraces 7 families of which the Naiadaceæ, Potamogetonaceæ, Alismaceæ, and Yallisneriaceæ are the chief.

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

  • noun an order of aquatic monocotyledonous herbaceous plants


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