‖Ne′re‐o‐cys″tis (?), n. [NL. See Nereid, and Cyst.] (Bot.) A genus of gigantic seaweeds.
☞ 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.