any tall, reedlike marsh plant of the genus Typha, esp. T. latifolia, having long, sword-shaped leaves and dense, cylindrical clusters of minute brown flowers.
cat·tail (kāt'tāl') n. Any of various perennial herbs of the genus Typha, widespread in marshy places and having long straplike leaves and a dense cylindrical cluster of minute flowers and fruits. Also called reed mace.