Homarus americanus

from WordNet (r) 3.0 (2006)

Homarus americanus
    n 1: lobster of Atlantic coast of America [syn: {American
         lobster}, {Northern lobster}, {Maine lobster}, {Homarus
         americanus}]

from The Collaborative International Dictionary of English v.0.48

Lobster \Lob"ster\, n. [AS. loppestre, lopystre prob., corrupted
   fr. L. locusta a marine shellfish, a kind of lobster, a
   locust. Cf. {Locust}.] (Zool.)
   1. Any large macrurous crustacean used as food, esp. those of
      the genus {Homarus}; as the American lobster ({Homarus
      Americanus}), and the European lobster ({Homarus
      vulgaris}). The Norwegian lobster ({Nephrops Norvegicus})
      is similar in form. All these have a pair of large unequal
      claws. The spiny lobsters of more southern waters,
      belonging to {Palinurus}, {Panulirus}, and allied genera,
      have no large claws. The fresh-water crayfishes are
      sometimes called lobsters.
      [1913 Webster]

   2. As a term of opprobrium or contempt: A gullible, awkward,
      bungling, or undesirable person. [Slang]
      [Webster 1913 Suppl.]

   {Lobster caterpillar} (Zool.), the caterpillar of a European
      bombycid moth ({Stauropus fagi}); -- so called from its
      form.

   {Lobster louse} (Zool.), a copepod crustacean ({Nicotho["e]
      astaci}) parasitic on the gills of the European lobster.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

maine lobster \maine lobster\ n.
   1. Any of several cold-water lobsters with large tender
      claws, caught from Maine to the Carolinas.

   Syn: American lobster, Northern lobster.
        [WordNet 1.5]

   2. A lobster ({Homarus americanus}) found off the Atlantic
      coast of North America.

   Syn: American lobster, Northern lobster, {Homarus
        americanus}.
        [WordNet 1.5]