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Definition of Invasive species
1. Noun. (biology) Any species that has been introduced to an environment where it is not native, and that has since become a nuisance through rapid spread and increase in numbers, often to the detriment of native species. ¹
¹ Source: wiktionary.com
Medical Definition of Invasive species
1. Non-native species disrupting and replacing native species. (09 Oct 1997)