The Open Dictionary

arachnid

noun

UK/əˈræk.nɪd/
US/əˈræk.nɪd/

Definitions of arachnid noun

  1. Countablebiology

    A member of the class Arachnida, a group of arthropods characterized by having four pairs of legs, including spiders, scorpions, ticks, and mites.

    • Scientists are studying the venom of this new arachnid species.

    • We must be careful in the wilderness, as many arachnids are venomous.

    • Ticks are a common type of arachnid that feed on the blood of mammals.