2. designating a family (Potamogetonaceae, order Najadales) of monocotyledonous water
plants, including eelgrass
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.