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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

del·e·te·ri·ous

Audio Help [del-i-teer-ee-uh

–adjective

1.	injurious to health: deleterious gases.

2.	harmful; injurious: deleterious influences.

[Origin: 1635–45; < Gk délétrios destructive, adj. deriv. of délétr destroyer, equiv. to délé- var. s. of déleǐsthai to hurt, injure + -tér agent suffix + -ios adj. suffix; see -ious

]

—Related forms

del·e·te·ri·ous·ly, adverb

del·e·te·ri·ous·ness, noun

—Synonyms 2. pernicious, hurtful, destructive; noxious.

—Antonyms 2. beneficial.

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
deleterious

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American Heritage Dictionary - Cite This Source - Share This

del·e·te·ri·ous Audio Help (děl'ĭ-tîr'ē-əs) Pronunciation Key
adj. Having a harmful effect; injurious: the deleterious effects of smoking.

[From Greek dēlētērios, from dēlētēr, destroyer, from dēleisthai, to harm.]

del'e·te'ri·ous·ly adv., del'e·te'ri·ous·ness n.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
deleterious

1643, from Gk. deleterios, from deleter "destroyer," from deleisthai "to hurt, injure."

WordNet - Cite This Source - Share This

deleterious
adjective
harmful to living things; "deleterious chemical additives"

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

del·e·te·ri·ous (dl-tr-s)
adj.

Having a harmful effect; injurious.

Merriam-Webster's Medical Dictionary - Cite This Source - Share This

Main Entry: del·e·te·ri·ous
Pronunciation: "del-&-'tir-E-&s
Function: adjective
: harmful often in a subtle or an unexpected way <the controversial question as to whether prolonged weightlessness has deleterious effects —The Sciences> <deleterious genes>

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Deleterious

Del`e*te"ri*ous\, a. [LL. deleterius noxious, Gr. dhlhth`rios, fr. dhlei^sqai to hurt, damage; prob. akin to L. delere to destroy.] Hurtful; noxious; destructive; pernicious; as, a deleterious plant or quality; a deleterious example. -- Del`e*te"ri*ous*ly, adv. -- Del`e*te"ri*ous*ness, n.

Dictionary.com Word of the Day Archive - Cite This Source - Share This

deleterious

deleterious was Word of the Day on May 24, 2000.

Dictionary.com Word of the Day

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