arachnid

[uh-rak-nid] /əˈræk nɪd/
noun
1.
any wingless, carnivorous arthropod of the class Arachnida, including spiders, scorpions, mites, ticks, and daddy-longlegs, having a body divided into two parts, the cephalothorax and the abdomen, and having eight appendages and no antennae.
Compare insect.
adjective
2.
belonging or pertaining to the arachnids.
Origin
1865–70; < Neo-Latin Arachnida < Greek aráchn(ē) spider, spider's web + Neo-Latin -ida -ida
Related forms
arachnidan
[uh-rak-ni-duh n] /əˈræk nɪ dən/ (Show IPA),
adjective, noun
British Dictionary definitions for arachnidan
arachnid (əˈræknɪd)
 
n
any terrestrial chelicerate arthropod of the class Arachnida, characterized by simple eyes and four pairs of legs. The group includes the spiders, scorpions, ticks, mites, and harvestmen
 
[C19: from New Latin Arachnida, from Greek arakhnē spider]
 
a'rachnidan
 
adj, —n

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Word Origin and History for arachnidan
arachnid
1869, from Fr. arachnide (1806) or Mod.L. Arachnida, introduced as name for this class of arthropods 1815 by Fr. biologist Jean Baptiste Pierre Antoine de Monet de Lamarck (1744-1829), from Gk. arakhne "spider," which probably is cognate with L. aranea "spider, spider's web" (from aracsna).
Online Etymology Dictionary, © 2010 Douglas Harper
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arachnidan in Science
arachnid
  (ə-rāk'nĭd)   
Any of various arthropods of the class Arachnida, such as spiders, scorpions, mites, and ticks. Arthropods are characterized by four pairs of segmented legs and a body that is divided into two regions, the cephalothorax and the abdomen.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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