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Webster's Dictionary (1865)

Sēa'-craw'/fish, n.

noun

n. (Zoöl.) A crustacean of the genus Palinurus, having a very hard shell. P. vulgaris is the spiny lobster, much used as an article of food.

An engraved illustration of a sea-crawfish viewed from above, showing its segmented body, legs, and long curved antennae.
Sea-crawfish (Palinurus vulgaris).