: 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 expresssense 3) a desired trait or traits : an organism manipulated by genetic modification for the purpose of changing one or more phenotypic characteristics : genetically modified organismsense 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 organismsense 2—sometimes used before another noun
GMO medicines
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