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horseshoe crab

Short definition from Wiktionary

Noun

  1. Any extinct or extant chelicerate in the order Xiphosura, actually more related to arachnids than true crabs.
  2. Any extinct or extant chelicerate in the order Xiphosura, actually more related to arachnids than true crabs: Any extant xiphosuran in the family Limulidae.

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