[nok-yoo-uh s]


likely to cause damage or injury; harmful; noxious.

Origin of nocuous

1625–35; < Latin nocuus harmful, injurious, equivalent to noc(ēre) to harm + -uus deverbal adj. suffix; see -ous
Related formsnoc·u·ous·ly, adverbnoc·u·ous·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for nocuous



rare harmful; noxious
Derived Formsnocuously, adverbnocuousness, noun

Word Origin for nocuous

C17: from Latin nocuus, from nocēre 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 nocuous

1630s, "noxious, harmful," from Latin nocuus "harmful," from stem of nocere "to hurt, injure, harm" (see innocuous).

Online Etymology Dictionary, © 2010 Douglas Harper