Arachnida A·rach·ni·da (ə-rāk'nĭ-də)
A class of arthropods that includes spiders, scorpions, mites, and ticks.
|a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings|
|a chattering or flighty, light-headed person.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|