• Webster's Revised Unabridged Dictionary
    • n Matweed (Bot) A name of several maritime grasses, as the sea sand-reed (Ammophila arundinacea) which is used in Holland to bind the sand of the seacoast dikes (see Beach grass, under Beach); also, the Lygeum Spartum, a Mediterranean grass of similar habit.
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Century Dictionary and Cyclopedia
    • n matweed A grass, Ammophila arundinacea (Psamma arenaria): so called from its use in making mats. Also called sea-mat-weed, halm, and marram.
    • n matweed Less properly— Spartina stricta, seaside-grass.
    • n matweed Nardus stricta, small matweed (see mat-grass)
    • n matweed Lygeum Spartum, hooded matweed.
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In literature:

The next day I looked over my load of matweed, having given it that name, and separated the different lengths from each other.
"Life And Adventures Of Peter Wilkins, Vol. I. (of II.)" by Robert Paltock