arachnid

n. arthropod characterized by four pairs of legs and the absence of wings and antennae (belongs to the class that includes scorpions, ticks, and spiders)

Arachnids are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. Arachnids are named after the mythological figure Arachne. They are chiefly terrestrial arthropods, comprising some 65,000 to 73,000 named species including spiders, scorpions, harvestmen, ticks, and mites.
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Noun
1. air-breathing arthropods characterized by simple eyes and four pairs of legs
(synonym) arachnoid
(hypernym) arthropod
(hyponym) harvestman, daddy longlegs, Phalangium opilio
(member-holonym) Arachnida, class Arachnida

(n.)
An arachnidan.
  

arachnid /ə'ræknid/
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