Definition of arachnid noun from the Oxford Advanced Learner's Dictionary

 

arachnid

 noun
noun
BrE BrE//əˈræknɪd//
 
; NAmE NAmE//əˈræknɪd//
 
(specialist)
 
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any small creature of the class that includes spiders, scorpions, mites and ticks compare insect
See the Oxford Advanced American Dictionary entry: arachnid