in vitro

adverb or adjective

in vi·​tro in-ˈvē-(ˌ)trō How to pronounce in vitro (audio) -ˈvi- How to pronounce in vitro (audio)
-ˈwē-
: outside the living body and in an artificial environment

Examples of in vitro in a Sentence

Recent Examples on the Web
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.
The initiative is part of a broader effort to expand access to in vitro fertilization (IVF) and reduce its cost, though key details about its implementation remain unclear. Alexandra Banner, CNN Money, 17 Oct. 2025 The Oval Office announcement offers a first glimpse at how Trump plans to follow up on his executive order earlier this year aiming to reduce the cost of in vitro fertilization, a medical procedure that helps people facing infertility build their families. Ali Swenson, Fortune, 16 Oct. 2025 Only about one in four large employers currently provides in vitro fertilization coverage, according to a report from KFF, a nonprofit research organization, and very few states require insurance companies to cover fertility treatments. Nik Popli, Time, 16 Oct. 2025 Guan and her team plan to test their ideas with in vitro studies. Manon Bischoff, Scientific American, 16 Oct. 2025 See All Example Sentences for in vitro

Word History

Etymology

New Latin, literally, in glass

First Known Use

circa 1894, in the meaning defined above

Time Traveler
The first known use of in vitro was circa 1894

Cite this Entry

“In vitro.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20vitro. Accessed 25 Oct. 2025.

Kids Definition

in vitro

adverb or adjective
in vi·​tro in-ˈvē-(ˌ)trō How to pronounce in vitro (audio)
: outside the living body and in an artificial environment
an egg fertilized in vitro
Etymology

Latin, literally, "in glass"

Medical Definition

in vitro

adverb or adjective
: outside the living body and in an artificial environment
growth of cells in vitro
in vitro studies
Last Updated: - Updated example sentences
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