lob·ster /ˈlɑbstɚ/
  龍蝦
  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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  lobster
       n 1: flesh of a lobster
       2: any of several edible marine crustaceans of the families
          Homaridae and Nephropsidae and Palinuridae