Arachnida \A*rach"ni*da\, n. pl. [NL., fr. Gr. ? spider.]
(Zo["o]l.)
One of the classes of Arthropoda. See Illustration in
Appendix.
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.
Source: Webster's Revised Unabridged Dictionary (1913)
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Acarina \Ac`a*ri"na\, n. pl. [NL., from Gr. ? a mite.]
(Zo["o]l.)
The group of Arachnida which includes the mites and ticks.
Many species are parasitic, and cause diseases like the itch
and mange.
Source: Webster's Revised Unabridged Dictionary (1913)
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