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deleterious

[del-i-teer-ee-uh s]
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adjective
  1. injurious to health: deleterious gases.
  2. harmful; injurious: deleterious influences.
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Origin of deleterious

1635–45; < Greek dēlētḗrios destructive, adj. derivative of dēlētḗr destroyer, equivalent to dēlē- variant stem of dēleîsthai to hurt, injure + -tēr agent suffix + -ios adj. suffix; see -ious
Related formsdel·e·te·ri·ous·ly, adverbdel·e·te·ri·ous·ness, nounnon·del·e·te·ri·ous, adjectivenon·del·e·te·ri·ous·ly, adverbnon·del·e·te·ri·ous·ness, nounun·del·e·te·ri·ous, adjectiveun·del·e·te·ri·ous·ly, adverbun·del·e·te·ri·ous·ness, noun

Synonyms

See more synonyms for deleterious on Thesaurus.com
2. pernicious, hurtful, destructive; noxious.

Antonyms

2. beneficial.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for deleterious

deleterious

adjective
  1. harmful; injurious; hurtful
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Derived Formsdeleteriously, adverbdeleteriousness, noun

Word Origin

C17: from New Latin dēlētērius, from Greek dēlētērios injurious, destructive, from dēleisthai to hurt
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for deleterious

adj.

1640s, from Medieval Latin deleterius, from Greek deleterios "noxious," from deleter "destroyer," from deleisthai "to hurt, injure." Related: Deleteriously; deleteriousness.

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Online Etymology Dictionary, © 2010 Douglas Harper

deleterious in Medicine

deleterious

(dĕl′ĭ-tîrē-əs)
adj.
  1. Having a harmful effect; injurious.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.