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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 A·rach·ni·da n. pl.  Zool. One of the classes of Arthropoda. See Illustration in Appendix.
 Note: ☞ They have four pairs of legs, no antennæ nor wings, a pair of mandibles, and one pair of maxillæ or palpi. The head is usually consolidated with the thorax. The respiration is either by trancheæ or by pulmonary sacs, or by both. The class includes three principal orders: {Araneina}, or spiders; {Arthrogastra}, including scorpions, etc.; and {Acarina}, or mites and ticks.
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From: Webster's Revised Unabridged Dictionary (1913)

 A·ra·ne·i·na n. pl.  Zool. The order of Arachnida that includes the spiders.
 Note: ☞ They have mandibles, modified as poison fangs, leglike palpi, simple eyes, abdomen without segments, and spinnerets for spinning a web. They breathe by pulmonary sacs and tracheæ in the abdomen. See Illustration in Appendix.
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