in vivo
adverb or adjective
in vi·vo
in-ˈvē-(ˌ)vō 
-ˈwē-(ˌ)wō
: in the living body of a plant or animal
Examples of in vivo in a Sentence
Recent Examples on the Web
The team hypothesizes that natural uterine contractions could influence implantation in vivo, highlighting the dynamic interaction between embryo and uterus.
—
Neetika Walter, Interesting Engineering, 16 Aug. 2025
The scientists next extended their study to in vivo models, examining how psilocybin affected 19-month-old mice, an age roughly equivalent to that of a 60-to 65-year-old human.
—Ruairi MacKenzie, Discover Magazine, 16 July 2025
Exits - AbbVie agreed to acquire Capstan Therapeutics, a San Diego-based in vivo RNA technology biotech, for $2.1 billion in cash.
—Allie Garfinkle, Fortune, 1 July 2025
Mustang Bio has terminated several product candidates and associated licenses, including gene therapy products and an in vivo CAR-T program, to focus resources on priority candidates.
—Quartz Intelligence Newsroom, Quartz, 28 Mar. 2025
See All Example Sentences for in vivo
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Neetika Walter, Interesting Engineering, 16 Aug. 2025
The scientists next extended their study to in vivo models, examining how psilocybin affected 19-month-old mice, an age roughly equivalent to that of a 60-to 65-year-old human.
—Ruairi MacKenzie, Discover Magazine, 16 July 2025
Exits - AbbVie agreed to acquire Capstan Therapeutics, a San Diego-based in vivo RNA technology biotech, for $2.1 billion in cash.
—Allie Garfinkle, Fortune, 1 July 2025
Mustang Bio has terminated several product candidates and associated licenses, including gene therapy products and an in vivo CAR-T program, to focus resources on priority candidates.
—Quartz Intelligence Newsroom, Quartz, 28 Mar. 2025
See All Example Sentences for in vivo
Cite this Entry
“In vivo.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20vivo. Accessed 10 Sep. 2025.
Copy CitationKids Definition
in vivo
adverb or adjective
in vi·vo
in-ˈvē-(ˌ)vō
-ˈwē-(ˌ)wō
: inside the living body of a plant or animal
in vivo activity
Etymology
Latin, literally, "in the living"
Medical Definition
in vivo
adverb or adjective
in vi·vo
in-ˈvē-(ˌ)vō
1
: in the living body of a plant or animal
in vivo synthesis of DNA
microorganisms are not ordinarily destroyed in vivo{/qi} by bacteriostatic drugs—The Journal of the American Medical Association
The Journal of the American Medical Association2
: in a real-life situation
observing a patient's behavior in vivo
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