• WordNet 3.6
    • n pycnogonid any of various small spiderlike marine arthropods having small thin bodies and long slender legs
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Webster's Revised Unabridged Dictionary
    • n Pycnogonid (Zoöl) One of the Pycnogonida.
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Century Dictionary and Cyclopedia
    • n pycnogonid Any one of the Pycnogonida.
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In literature:

The strange nobody-crabs or Pycnogonids occupy a place on the ascending half of the arc below the Eurypterines and Limulus.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various