Arachnida

Medical Dictionary

Arachnida A·rach·ni·da (ə-rāk'nĭ-də)
n.
A class of arthropods that includes spiders, scorpions, mites, and ticks.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Arachnida is always a great word to know.
So is zedonk. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
WordNet
arachnida

noun
a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings 
WordNet® 3.0, © 2006 by Princeton University.
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