Deleterious meaning

dĕlĭ-tîrē-əs
Having a harmful effect; injurious.

The deleterious effects of smoking.

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The definition of deleterious is something that is harmful or damaging.

An example of deleterious is how smoking can kill a human being.

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Harmful to health or well-being; injurious.
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Harmful often in a subtle or unexpected way (as for example deleterious effects, deleterious to health).
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Origin of deleterious

  • From Greek dēlētērios from dēlētēr destroyer from dēleisthai to harm

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek δηλητήριος (dēlētērios, “noxious, deleterious”), from δηλητήρ (dēlētēr, “a destroyer”), from δηλέομαι (dēleomai, “I hurt, damage, spoil, waste”).

    From Wiktionary