in vivo

adverb or adjective
in vi·​vo | \ in-ˈvē-(ˌ)vō How to pronounce in vivo (audio) , -ˈwē-(ˌ)wō \

Definition of in vivo

: in the living body of a plant or animal

Examples of in vivo in a Sentence

Recent Examples on the Web The goal of my thesis is to investigate an in vivo model of a premature aging disorder. Alex Zhavoronkov, Forbes, 24 May 2021 However, there is still no data on the potency of the antibodies in vivo or in patient bodies, says Kyratsous. Aayushi Pratap, Forbes, 16 Apr. 2021 The totality of the data from these studies indicates that molnupiravir is not mutagenic or genotoxic in in vivo mammalian systems. Chris Smith, BGR, 8 Mar. 2021 That way, scientists can study cancer development in vivo. Courtney Linder, Popular Mechanics, 9 Sep. 2020 Molecular biologist Reza Kalhor started his lab (part computational, part molecular and experimental, studying in vivo barcoding) at Johns Hopkins University last October. Chris Wright, Wired, 8 June 2020 Although studies are already underway with viral vectors that deliver new genes to certain tissues in people, in vivo gene therapy has only been used to modify blood stem cells in animal models of certain diseases. Jon Cohen, Science | AAAS, 23 Oct. 2019 These can be conducted in vitro (using cells in a laboratory dish) or in vivo (using an animal as a stand-in for humans). Los Angeles Times, 12 Mar. 2020 There are experimental antivirals that have been used in vitro and in vivo. Tanya Lewis, Scientific American, 22 Jan. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'in vivo.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of in vivo

1901, in the meaning defined above

History and Etymology for in vivo

New Latin, literally, in the living

Keep scrolling for more

Learn More About in vivo

Time Traveler for in vivo

Time Traveler

The first known use of in vivo was in 1901

See more words from the same year

Statistics for in vivo

Last Updated

16 Jun 2021

Cite this Entry

“In vivo.” Dictionary, Merriam-Webster, Accessed 23 Jun. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for in vivo

in vivo

adverb or adjective
in vi·​vo | \ in-ˈvē-(ˌ)vō How to pronounce in vivo (audio) \

Medical Definition of in vivo

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


Test Your Vocabulary

Return of Name that Color!

  • a light greenish blue color
  • Name that color:
Name That Thing

Test your visual vocabulary with our 10-question challenge!


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!