Wa'ter-mil'foil, n.
n. (Bot.) A perennial aquatic plant of the genus Myriophyllum, having crowded, often whorled leaves, of which those under water are pinnately parted into capillary divisions. Gray.
n. (Bot.) A perennial aquatic plant of the genus Myriophyllum, having crowded, often whorled leaves, of which those under water are pinnately parted into capillary divisions. Gray.