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
GOOSES. GEESES. I WANT THIS QUIZ ON PLURAL NOUNS!
Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?

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