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

Working with David Liu, Sam Berns’ mom, and Leslie Gordon of the Progeria Research Foundation, my research group has already shown that a single intravenous infusion of an in vivo gene editor can dramatically extend the life of mice that have been engineered to carry the human progeria mutation. —Francis Collins, WIRED, 7 Jan. 2025

Several different miniature microscopes designed for in vivo experiments in animals exist. —IEEE Spectrum, 13 Oct. 2024

Sana continues to focus on developing its ex vivo and in vivo cell engineering platforms and advancing its pipeline of product candidates. —Quartz Bot, Quartz, 8 Nov. 2024

Geranium Oil Research shows that geranium oil demonstrated hair growth in in vitro (performed in a lab dish or test tube) and in vivo (performed on living organisms) studies. —Kathi Valeii, Verywell Health, 24 Oct. 2024

Word History

Etymology

New Latin, literally, in the living

First Known Use

1901, in the meaning defined above

Kids 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

2

: in a real-life situation

observing a patient's behavior in vivo