The Collaborative International Dictionary of English v.0.48:

Sea otter \Sea" ot"ter\ (Zool.)
   An aquatic carnivore (Enhydris lutris syn. Enhydris
   marina) found in the North Pacific Ocean. Its fur is highly
   valued, especially by the Chinese. It is allied to the common
   otter, but is larger, with feet more decidedly webbed.
   [1913 Webster]

   Sea-otter's cabbage (Bot.), a gigantic kelp of the Pacific
      Ocean (Nereocystis Lutkeana). See Nereocystis.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Kelp \Kelp\ (k[e^]lp), n. [Formerly kilpe; of unknown origin.]
   1. The calcined ashes of seaweed, -- formerly much used in
      the manufacture of glass, now used in the manufacture of
      iodine.
      [1913 Webster]

   2. (Bot.) Any large blackish seaweed.
      [1913 Webster]

   Note: Laminaria is the common kelp of Great Britain;
         Macrocystis pyrifera and Nereocystis Lutkeana are
         the great kelps of the Pacific Ocean.
         [1913 Webster]

   Kelp crab (Zool.), a California spider crab (Epialtus
      productus), found among seaweeds, which it resembles in
      color.

   Kelp salmon (Zool.), a serranoid food fish (Serranus
      clathratus) of California. See Cabrilla.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nereocystis \Ne`re*o*cys"tis\, prop. n. [NL. See Nereid, and
   Cyst.] (Bot.)
   A genus of gigantic seaweeds.
   [1913 Webster]

   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.
         [1913 Webster]