in vivo

adverb or adjective

in vi·​vo in-ˈvē-(ˌ)vō How to pronounce in vivo (audio)
-ˈwē-(ˌ)wō
: in the living body of a plant or animal

Examples of in vivo in a Sentence

Recent Examples on the Web To test the in vivo effect short term the team injected T cell leukemia cells into mice and followed three days later with normal and activated T cells, CAR T cells, or STAb cells. William A. Haseltine, Forbes, 13 Feb. 2023 Parker learned this type of in vivo imaging during a postdoc as a Pfizer employee doing research at Stanford University with Mark Schnitzer, a biophysicist who pioneered the method to study neurons more generally. WIRED, 7 Aug. 2023 Intellia is one of the leading companies working to advance in vivo gene editing therapies. Megan Molteni, STAT, 21 Aug. 2023 This underlying problem of access may require other improved technologies such as the use of mRNA to modify cells in vivo, as well. William A. Haseltine, Forbes, 23 Feb. 2023 The study was conducted in vitro and is not comparable to in vivo research, Urrialde said. Carla Delgado, Verywell Health, 5 July 2023 Enhanced evaluation of selective androgen receptor modulators in vivo. The Salt Lake Tribune, 25 July 2023 To find out whether dog hookworms are resistant to any of these drugs, Kaplan began a series of laborious in vitro and in vivo tests on hookworm samples from three dogs with stubborn infections, including one greyhound named Worthy. Bradley Van Paridon, Scientific American, 1 June 2023 Novartis has recognized the importance of this and is working with the Bill & Melinda Gates Foundation on an ambitious project to deliver gene medicines in vivo — or directly into the body — instead of via the current complex ex vivo process. Jayasree K. Iyer, STAT, 12 July 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'in vivo.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

New Latin, literally, in the living

First Known Use

1901, in the meaning defined above

Time Traveler
The first known use of in vivo was in 1901

Dictionary Entries Near in vivo

Cite this Entry

“In vivo.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20vivo. Accessed 9 Dec. 2023.

Kids Definition

in vivo

adverb or adjective
in vi·​vo in-ˈvē-(ˌ)vō How to pronounce in vivo (audio)
-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 How to pronounce in vivo (audio)
1
: in the living body of a plant or animal
in vivo synthesis of DNA
microorganisms are not ordinarily destroyed in vivo by bacteriostatic drugsJournal of the American Medical Association
2
: in a real-life situation
observing a patient's behavior in vivo
Last Updated: - 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!