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.
- Any of several edible marine crustaceans of the family Homaridae, especially of the genus Homarus, having stalked eyes, long antennae, and five pairs of legs, the first pair of which is modified into large pincers.
- Any of several crustaceans, such as the spiny lobster, that are related to the lobsters.
- The flesh of a lobster used as food.
- To search for and catch lobsters.