Definition of deleterious adjective from the Oxford Advanced Learner's Dictionary

 

deleterious

 adjective
adjective
BrE BrE//ˌdeləˈtɪəriəs//
 
; NAmE NAmE//ˌdeləˈtɪriəs//
 
(formal)
 
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harmful and damaging the deleterious effect of stress on health Word Origin mid 17th cent.: via medieval Latin from Greek dēlētērios ‘noxious’ + -ous.
See the Oxford Advanced American Dictionary entry: deleterious