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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
1865-1870
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for arachnid
  • The nocturnal arachnid uses venom to subdue their prey.
  • Among arachnid enthusiasts, these spiders have become popular pets.
British Dictionary definitions for arachnid

arachnid

/əˈræknɪd/
noun
1.
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
Derived Forms
arachnidan, adjective, noun
Word Origin
C19: from New Latin Arachnida, from Greek arakhnē spider
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for arachnid
n.

"a spider," 1869, from French arachnide (1806) or Modern Latin Arachnida, introduced as name for this class of arthropods 1815 by French biologist Jean Baptiste Pierre Antoine de Monet de Lamarck (1744-1829), from Greek arakhne (fem.) "spider; spider's web," which probably is cognate with Latin aranea "spider, spider's web" (borrowed in Old English as renge "spider"), from aracsna. The Latin word could be a Greek borrowing or both could be from a common root. An earlier noun form was arachnidian (1828).

Online Etymology Dictionary, © 2010 Douglas Harper
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arachnid 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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