Any large macrurous crustacean used as food, esp. those of
   the genus Homarus; as the American lobster (H. Americanus), and the
   European lobster (H. 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.