毒性の定義と意味 | Dictionary.com

POISONOUS Definition & Meaning | Dictionary.com Synonyms poisonous American [ poi -z uh -n uh 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. poisonous British / ˈpɔɪzənəs / adjective having the effects or qualities of a poison capable of killing or inflicting injury; venomous corruptive or malicious "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 Other Word Forms nonpoisonous adjective nonpoisonously adverb nonpoisonousness noun poisonously adverb poisonousness noun semipoisonous adjective semipoisonously adverb unpoisonous adjective unpoisonously adverb Etymology Origin of poisonous First recorded in 1565–75; poison + -ous Compare meaning How does poisonous compare to similar and commonly confused words? Explore the most common comparisons: poisonous vs. venomous Explanation What do arsenic, cyanide, and bleach all have in common? They're poisonous . In other words, if you ingest these poisonous chemicals, you will most likely die or become very ill. If something is poisonous, you'd better not eat, drink, inhale, or touch it: it will make you sick. Some poisonous materials can even kill you. Of course, this adjective is derived from the noun poison , which is a toxic substance. You can also calls things poisonous if they're harmful in less physical ways. Spreading lies about someone is poisonous. Betraying a friend is poisonous. What both kinds of poisonous things have in common is that they do damage. Keep Reading on Vocabulary.com Vocabulary lists containing poisonous Week 4 Vocabulary Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide! Harmful, List 2 Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use! -ious, -eous, -ous Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time! Example Sentences Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com. It’s got poisonous lead in it from paint. From Salon • Mar. 6, 2026 But there are dozens of other poisonous snake species for which India does not have targeted antivenom. From BBC • Feb. 1, 2026 The death cap is the world’s most poisonous mushroom, responsible for 90% of mushroom-related fatalities. From Los Angeles Times • Jan. 16, 2026 Hydrogen cyanide, which is highly poisonous, can freeze into crystals at low temperatures. From Science Daily • Jan. 16, 2026 Count Olaf had eaten some, so it probably wasn’t poisonous, and anyway she was very hungry. From "The Bad Beginning" by Lemony Snicket Related Words dangerous deadly destructive fatal lethal noxious pernicious toxic venomous vicious virulent Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023 Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.