Dictionary

deleterious

deleterious

adjective del·e·te·ri·ous \ˌde-lə-ˈtir-ē-əs\

: damaging or harmful

Full Definition of DELETERIOUS

:  harmful often in a subtle or unexpected way <deleterious effects> <deleterious to health>
del·e·te·ri·ous·ly adverb
del·e·te·ri·ous·ness noun

Examples of DELETERIOUS

  1. The chemical is deleterious to the environment.
  2. The drug has no deleterious effects on patients.
  3. In developing countries, the imposition of boundaries around national parks and protected areas has been deleterious for both people and wildlife. —Kristin B. Gunther, Association of American Geographers, 2002

Origin of DELETERIOUS

Greek dēlētērios, from dēleisthai to hurt
First Known Use: 1643

deleterious

adjective del·e·te·ri·ous \ˌdel-ə-ˈtir-ē-əs\   (Medical Dictionary)

Medical Definition of DELETERIOUS

:  harmful often in a subtle or an unexpected way <the deleterious effects of radiation and chemotherapy on the marrow—Christine Gorman> <deleterious genes>

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