Stone·root n. Bot. A North American plant (Collinsonia Canadensis) having a very hard root; horse balm. See Horse balm, under Horse.
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  stone-root
       n : erect perennial strong-scented with serrate pointed leaves
           and a loose panicle of yellowish flowers; the eastern
           United States [syn: horse balm, horseweed, stoneroot,
            richweed, stone root, Collinsonia canadensis]
  stoneroot
       n : erect perennial strong-scented with serrate pointed leaves
           and a loose panicle of yellowish flowers; the eastern
           United States [syn: horse balm, horseweed, stone-root,
            richweed, stone root, Collinsonia canadensis]