Bul"rush` (?), n. [OE. bulrysche, bolroysche; of uncertain origin, perh. fr. bole stem + rush.] Bot.
A kind of large rush, growing in wet land or in water.
⇒ The name bulrush is applied in England especially to the cat-tail (Typha latifolia and T. angustifolia) and to the lake club-rush (Scirpus lacustris); in America, to the Juncus effusus, and also to species of Scirpus or club-rush.
© Webster 1913.