Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Medieval Latin
Origin: deleterius, from Greek deleisthai 'to hurt'

deleterious

 adjective
     
del‧e‧ter‧i‧ous formal
damaging or harmful:
the deleterious effects of smoking
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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