Source : Webster's Revised Unabridged Dictionary (1913)

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.