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