follow Dictionary.com

11 Trending Words of 2014

deleterious

[del-i-teer-ee-uh s] /ˌdɛl ɪˈtɪər i əs/
adjective
1.
injurious to health:
deleterious gases.
2.
harmful; injurious:
deleterious influences.
Origin
1635-1645
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 forms
deleteriously, adverb
deleteriousness, noun
nondeleterious, adjective
nondeleteriously, adverb
nondeleteriousness, noun
undeleterious, adjective
undeleteriously, adverb
undeleteriousness, noun
Synonyms
2. pernicious, hurtful, destructive; noxious.
Antonyms
2. beneficial.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for un-deleterious

deleterious

/ˌdɛlɪˈtɪərɪəs/
adjective
1.
harmful; injurious; hurtful
Derived Forms
deleteriously, adverb
deleteriousness, 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
Cite This Source
Word Origin and History for un-deleterious

deleterious

adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
un-deleterious in Medicine

deleterious del·e·te·ri·ous (děl'ĭ-tēr'ē-əs)
adj.
Having a harmful effect; injurious.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source

Word of the Day

Difficulty index for deleterious

Few English speakers likely know this word

Word Value for un

2
4
Scrabble Words With Friends

Quotes with un-deleterious

Nearby words for un-deleterious