lobster

A crustacean of the Nephropidae family, dark green or blue-black in colour turning bright red when cooked, with a hard shell and claws, which is used as a seafood.

Various other crustaceans that resemble true lobsters:

Various other crustaceans that resemble true lobsters:

Various other crustaceans that resemble true lobsters:

A soldier or officer of the imperial British Army (due to their red or scarlet uniform).

[…] how the troops came marching out for evening exercise under Captain Preston; how pedestrians and street urchins taunted them, shouting "Lobsters," "Bloody-backs," and flinging snow-balls, turnips, […]

To fish for lobsters.

Red-colored, especially from a sunburn.