Dictionary![]() ![]() poi•son•ousPronunciation: (poi'zu-nus), [key] —adj. 1. full of or containing poison: poisonous air; a poisonous substance. 2. harmful; destructive: poisonous to animals; poisonous rumors. 3. deeply malicious; malevolent: poisonous efforts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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