毒性の定義と意味 - メリアム・ウェブスター

POISONOUS Definition & Meaning - Merriam-Webster Est. 1828 Dictionary Definition Definition Synonyms Example Sentences Word History Entries Near Cite this Entry Citation Kids Definition Kids Medical Definition Medical More from M-W Show more Show more Citation Kids Medical More from M-W Save Word To save this word, you'll need to log in. Log In poisonous adjective poi·​son·​ous ˈpȯiz-nəs ˈpȯi-zᵊn-əs Synonyms of poisonous Simple Definition A Simple Definition is available from our Learner's Dictionary to help you understand the meaning faster. 1 : destructive , harmful 2 a : having the properties or effects of poison poisonous gas b : producing a toxic substance that causes injury or death when absorbed or ingested poisonous mushrooms also : venomous a poisonous spider 3 : spiteful , malicious poisonous rumors poisonously adverb Synonyms of poisonous Relevance poisoned poison toxic venomous See All Synonyms & Antonyms in Thesaurus Examples of poisonous in a Sentence Chocolate is poisonous to dogs. This species of spider is extremely poisonous . Recent Examples on the Web Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback . Restoring the balance of the humors through profusely bleeding the patient or inducing vomiting or diarrhea with the poisonous plant hellebore. — Literary Hub , 28 Apr. 2026 There’s a steadiness to Tung/Wonder Woman that stands out for its quiet authority in a frequently goofy landscape peppered with poisonous robes and finger-eating minions. — Sarah Shachat, IndieWire , 24 Apr. 2026 The villain, though, is not Michael Jackson but his father, Joe, whose determination to get his boys out of Gary, Indiana, turns into something more poisonous . — Kelefa Sanneh, New Yorker , 20 Apr. 2026 Except for the Genetic Infantry, blue super soldiers engineered by the Southers to survive the poisonous atmosphere. — Jonathan M. Gitlin, ArsTechnica , 20 Apr. 2026 See All Example Sentences for poisonous Word History First Known Use 15th century, in the meaning defined at sense 2 Time Traveler The first known use of poisonous was in the 15th century See more words from the same century Browse Nearby Words poison oak poisonous poison out See all Nearby Words Cite this Entry Style MLA Chicago APA Merriam-Webster “Poisonous.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/poisonous. Accessed 5 May. 2026. Copy Citation Kids Definition poisonous adjective poi·​son·​ous ˈpȯiz-nəs -ᵊn-əs : containing poison : having or causing an effect of poison poisonously adverb Medical Definition poisonous adjective poi·​son·​ous ˈpȯiz-nəs, -ᵊn-əs 1 : having the properties or effects of poison poisonous gas 2 : producing a toxic substance that causes injury or death when absorbed or ingested poisonous frogs and plants also : venomous More from Merriam-Webster on poisonous Nglish: Translation of poisonous for Spanish Speakers Last Updated: 29 Apr 2026 - Updated example sentences Love words? Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Merriam-Webster unabridged More from Merriam-Webster Word of the Day augur See Definitions and Examples » Get Word of the Day daily email! Popular in Grammar & Usage See More More Commonly Mispronounced Words 5 Verbal Slip Ups and Language Mistakes Is that lie 'bald-faced' or 'bold-faced'? The Difference Between 'i.e.' and 'e.g.' Why is '-ed' sometimes pronounced at the end of a word? See More Popular in Wordplay See More The Longest Long Words List 9 Other Words for Beautiful The Words of the Week - May 1 Was 'nervous Nellie' a Real Person? 12 Lovely and Unusual Words for the Natural World See More Popular See More More Commonly Mispronounced Words The Longest Long Words List 9 Other Words for Beautiful See More Games & Quizzes See All Quordle Can you solve 4 words at once? Play Blossom Pick the best words! Play The Missing Letter A daily crossword with a twist Play Name That Tree! A quiz that’s all bark, no bite. Take the quiz See All