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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. 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. Also called arachnoid.

Century Dictionary and Cyclopedia

  1. n. One of the Arachnida; an arachnidan.

Wiktionary

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

GNU Webster's 1913

  1. n. An arachnidan.

WordNet 3.0

  1. n. air-breathing arthropods characterized by simple eyes and four pairs of legs

Etymologies

  1. From New Latin Arachnida, class name, from Greek arakhnē, spider.

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‘arachnid’ has been looked up 1697 times, added to 17 lists, and has a Scrabble score of 14.