Dictionary.com

deleterious

[ del-i-teer-ee-uhs ]
/ ˌdɛl ɪˈtɪər i əs /
Save This Word!

adjective
injurious to health: deleterious gases.
harmful; injurious: deleterious influences.
QUIZ
QUIZ YOURSELF ON AFFECT VS. EFFECT!
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

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

OTHER WORDS FROM deleterious

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use deleterious in a sentence

British Dictionary definitions for deleterious

deleterious
/ (ˌdɛlɪˈtɪərɪəs) /

adjective
harmful; injurious; hurtful

Derived forms of deleterious

deleteriously, adverbdeleteriousness, noun

Word Origin for deleterious

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

Medical definitions for deleterious

deleterious
[ dĕl′ĭ-tîrē-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.
FEEDBACK