Arachnid Definition

ə-răknĭd
arachnids
noun
arachnids
Any of a large class (Arachnida) of chiefly terrestrial arthropods, including spiders, scorpions, mites, and ticks, typically with four pairs of legs, either lungs or tracheae, a liquid diet, no antennae, simple eyes, sensory pedipalps, and a body divided into cephalothorax and abdomen.
Webster's New World
Any of various arthropods of the class Arachnida, such as spiders, scorpions, mites, and ticks, characterized by four pairs of segmented legs and a body that is divided into two regions, the cephalothorax and the abdomen.
American Heritage Medicine

Any of the eight-legged creatures, including spiders and scorpions, of the class Arachnida.

Wiktionary

Other Word Forms of Arachnid

Noun

Singular:
arachnid
Plural:
arachnids

Origin of Arachnid

  • From New Latin Arachnida class name from Greek arakhnē spider

    From American Heritage Dictionary of the English Language, 5th Edition

  • French arachnide (1809, Lamarck), from Ancient Greek ἀράχνη (arakhnē, “spider”).

    From Wiktionary

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