Deleterious Definition
 dĕlĭ-tîrē-əs 
    adjective
  
 Harmful to health or well-being; injurious.
 Webster's New World 
Harmful often in a subtle or unexpected way (as for example deleterious effects, deleterious to health).
 Wiktionary 
Synonyms: 
  Origin of Deleterious
- From Ancient Greek δηλητήριος (dēlētērios, “noxious, deleterious”), from δηλητήρ (dēlētēr, “a destroyer”), from δηλέομαι (dēleomai, “I hurt, damage, spoil, waste”). - From Wiktionary 
- From Greek dēlētērios from dēlētēr destroyer from dēleisthai to harm - From American Heritage Dictionary of the English Language, 5th Edition 
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