Lob·ster n.  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.
 2. As a term of opprobrium or contempt: A gullible, awkward, bungling, or undesirable person. [Slang]
 Lobster caterpillar Zool., the caterpillar of a European bombycid moth (Stauropus fagi); -- so called from its form. Lobster louse Zool., a copepod crustacean (Nicothoë astaci) parasitic on the gills of the European lobster.

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 Homarus vulgaris
      n : lobster of Atlantic coast of Europe [syn: European lobster]