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
Legend Biotech emerged as a rare market winner Shares of Legend Biotech soared over 40% yesterday after the company disclosed early data on its in vivo CAR-T therapy that showed promise in Non-Hodgkin’s lymphoma.
—
Elaine Chen,
STAT,
3 June 2026
Intellia Therapeutics released the world’s first-ever Phase 3 clinical trial results for an in vivo CRISPR gene-editing therapy.
—
Jon Markman,
Forbes.com,
29 Apr. 2026
Intellia's treatment, meanwhile, makes the edits inside the body, or in vivo.
—
Angelica Peebles,
CNBC,
27 Apr. 2026
Senolytic this, Hayflick limit that, telomeres and in vivo trials with mus muculus mice.
—
Literary Hub,
18 Mar. 2026
See All Example Sentences for in vivo
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.
Elaine Chen,
STAT,
3 June 2026
Intellia Therapeutics released the world’s first-ever Phase 3 clinical trial results for an in vivo CRISPR gene-editing therapy.
—
Jon Markman,
Forbes.com,
29 Apr. 2026
Intellia's treatment, meanwhile, makes the edits inside the body, or in vivo.
—
Angelica Peebles,
CNBC,
27 Apr. 2026
Senolytic this, Hayflick limit that, telomeres and in vivo trials with mus muculus mice.
—
Literary Hub,
18 Mar. 2026
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 7 Jul. 2026.
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 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
Love words? Need even more definitions?
Merriam-Webster unabridged
