poisonous

[ poi-zuh-nuhs ]
/ ˈpɔɪ zə nəs /
SEE SYNONYMS FOR poisonous ON THESAURUS.COM

adjective

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

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Origin of poisonous

First recorded in 1565–75; poison + -ous

OTHER WORDS FROM poisonous

Words nearby poisonous

poison haw, poison hemlock, poisoning, poison ivy, poison oak, poisonous, poison-pen, poison-pen letter, poison pill, poison sumac, poison sumach
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Words related to poisonous

fatal, noxious, dangerous, virulent, vicious, pernicious, lethal, deadly, toxic, venomous, destructive, bad, baleful, baneful, corrupt, deleterious, detrimental, evil, hurtful, malicious

Example sentences from the Web for poisonous

British Dictionary definitions for poisonous

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

Medical definitions for poisonous

poisonous
[ poi′zə-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.