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Webster's Dictionary (1865)

Līm'ŭ-lŭs, n.

noun

n.; pl. LĬM'Ŭ-LĪ. [Lat., diminutive of limus, side-long, askance.] (Zoöl.) A genus of crustaceans, including the king-crab, horse-shoe, or horse-foot.

An engraved illustration of a horseshoe crab viewed from above, with its long pointed tail extending downward.
Limulus, King-crab, or Horse-shoe.