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The Collaborative International Dictionary of English v.0.48 (gcide)

Arachnida \A*rach"ni*da\, n. pl. [NL., fr. Gr. ? spider.]
(Zool.)
One of the classes of Arthropoda. See Illustration in
Appendix.
[1913 Webster]

Note: They have four pairs of legs, no antenn[ae] nor wings,
a pair of mandibles, and one pair of maxill[ae] or
palpi. The head is usually consolidated with the
thorax. The respiration is either by tranche[ae] 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.
[1913 Webster]

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