horsebrier

from The Century Dictionary.

• noun The common greenbrier or cat-brier, Smilax rotundifolia.

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

• noun a very prickly woody vine (Smilax rotundifolia) of eastern U. S. growing in tangled masses having tough round stems with shiny leathery leaves and small greenish flowers followed by clusters of inedible shiny black berries.

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

• noun a very prickly woody vine of the eastern United States growing in tangled masses having tough round stems with shiny leathery leaves and small greenish flowers followed by clusters of inedible shiny black berries
• noun a very prickly woody vine of the eastern United States growing in tangled masses having tough round stems with shiny leathery leaves and small greenish flowers followed by clusters of inedible shiny black berries