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

 

arachnophobia

 noun
noun
BrE BrE//əˌræknəˈfəʊbiə//
 
; NAmE NAmE//əˌræknəˈfoʊbiə//
 
[uncountable]
 
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an extreme fear of spiders Word Origin 1920s: modern Latin, from Greek arakhnē ‘spider’ + -phobia (see phobia).
See the Oxford Advanced American Dictionary entry: arachnophobia