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from the GNU version of the Collaborative International Dictionary of English

  • A division of Arachnida including those that breathe only by means of tracheæ. It includes the mites, ticks, false scorpions, and harvestmen.

from The Century Dictionary and Cyclopedia

  • n. The tracheate arachnidans, an order of Arachnida comprising those which breathe by tracheæ alone.


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