Source : WordNet®

nailrod
     n : tall marsh plant with cylindrical seed heads that explode
         when mature shedding large quantities of down; its long
         flat leaves are used for making mats and chair seats; of
         North America, Europe, Asia and North Africa [syn: {cat's-tail},
          {bullrush}, {bulrush}, {reed mace}, {reedmace}, {Typha
         latifolia}]