Nereocystis \Ne`re*o*cys"tis\, n. [NL. See Nereid, and Cyst.]

(Bot.) A genus of gigantic seaweeds.

Note: Nereocystis Lutkeana, of the North Pacific, has a stem many fathoms long, terminating in a great vesicle, which is crowned with a tuft of long leaves. The stem is used by the Alaskans for fishing lines.

Source: Webster's Revised Unabridged Dictionary (1913)