poisonous

[ poi-zuh-nuh s ]
/ ˈpɔɪ zə nəs /

adjective

full of or containing poison: poisonous air; a poisonous substance.
harmful; destructive: poisonous to animals; poisonous rumors.
deeply malicious; malevolent: poisonous efforts.

Origin of poisonous

First recorded in 1565–75; poison + -ous

OTHER WORDS FROM poisonous

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for nonpoisonous

  • Her second-stage rockets were also of the nonpoisonous variety, because she fired them at a bare 60,000 feet.

    Space Tug|Murray Leinster
  • Several species of nonpoisonous snakes were more common but were nowhere really abundant.

    Camps and Trails in China|Roy Chapman Andrews and Yvette Borup Andrews
  • (e) The poisonous portions are not distinguishable from the nonpoisonous, either macroscopically or microscopically.

British Dictionary definitions for nonpoisonous (1 of 2)

nonpoisonous
/ (nɒnˈpɔɪzənəs) /

adjective

not having the effects or qualities of a poison

British Dictionary definitions for nonpoisonous (2 of 2)

poisonous
/ (ˈpɔɪzənəs) /

adjective

having the effects or qualities of a poison
capable of killing or inflicting injury; venomous
corruptive or malicious

Derived forms of poisonous

poisonously, adverbpoisonousness, noun
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

Medicine definitions for nonpoisonous

poisonous
[ poizə-nəs ]

adj.

Relating to or caused by a poison.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.