a·rach·nid

[uh-rak-nid]
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

a·rach·ni·dan [uh-rak-ni-duhn] , adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
arachnid (əˈræknɪd) [Click for IPA pronunciation guide]
 
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Arachnid is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

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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American Heritage
Science Dictionary
arachnid   (ə-rāk'nĭd)  Pronunciation Key 
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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Example sentences
The nocturnal arachnid uses venom to subdue their prey.
Among arachnid enthusiasts, these spiders have become popular pets.
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