plural GMOs
1
: a plant, animal, or microorganism whose DNA has been altered artificially through the insertion, deletion, or modification of one or more genes in order to express (see express entry 1 sense 4) or suppress (see suppress sense 6) a targeted trait or traits : genetically modified organism sense 1
… the corn is a genetically modified organism, often referred to as a GMO, and carries traits that repel insects and protect it from the herbicide … JD Malone
Most animals that are GMOs are produced for use in laboratory research. These animals are used as "models" to study the function of specific genes and, typically, how the genes relate to health and disease. National Geographic
sometimes used before another noun
In 2020, GMO soybeans made up 94% of all soybeans planted … and 92% of corn planted was GMO corn. U.S. Food & Drug Administration
2
: something (such as a fruit) that is the product of an organism and especially a plant that has undergone genetic modification : genetically modified organism sense 2
… the pink-colored flesh is not the result of a naturally-occurring mutation. Pink pineapple fruit is a … GMO. Laura Miller
sometimes used before another noun
Many parents are already limiting the amount of fast food that their children eat, and GMO french fries would give them another reason to pass by … Wenonah Hauter

Examples of GMO 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.
This meant no synthetic chemicals, no GMO seeds, helping recover forests through reforestation programs, developing conservation buffers, using rainwater only for irrigation, intercropping, cover cropping and ensuring that farmers were getting a fair price. Esha Chhabra, Forbes.com, 1 Apr. 2025 An analysis commissioned by Moms Across America and GMO Sciences said Girl Scout cookie samples contained heavy metals, including aluminum, arsenic, cadmium, lead and mercury. Betty Lin-Fisher, USA TODAY, 19 Mar. 2025

Word History

First Known Use

1989, in the meaning defined at sense 1

Time Traveler
The first known use of GMO was in 1989

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Cite this Entry

“GMO.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/GMO. Accessed 21 Apr. 2025.

Medical Definition

1
: a plant, animal, or microorganism whose DNA has been altered artificially through the insertion, deletion, or modification of one or more genes in order to express (see express sense 3) or suppress (see suppress sense 3) a targeted trait or traits : genetically modified organism sense 1
sometimes used before another noun
GMO lab mice
2
: something that is the product of an organism that has undergone genetic modification : genetically modified organism sense 2
sometimes used before another noun
GMO medicines
Last Updated: - Updated example sentences
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