sea spider

from WordNet (r) 3.0 (2006)

sea spider
    n 1: any of various small spiderlike marine arthropods having
         small thin bodies and long slender legs [syn: {sea spider},
         {pycnogonid}]

from The Collaborative International Dictionary of English v.0.48

Sea spider \Sea" spi"der\ (Zool.)
   (a) Any maioid crab; a spider crab. See {Maioid}, and {Spider
       crab}, under {Spider}.
   (b) Any pycnogonid.
       [1913 Webster]

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