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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Sea spi·der Zool. (a) Any maioid crab; a spider crab. See Maioid, and Spider crab, under Spider. (b) Any pycnogonid.
 

From: WordNet (r) 2.0

 sea spider
      n : any of various small spider-like marine arthropods having
          small thin bodies and long slender legs [syn: pycnogonid]