“Alien species” in Japanese
Short answer
Alien species in Japanese is “移入種” (inyuushu). Full meaning: introduced species, non-native species, alien species.
Other ways to say “Alien species” in Japanese
外来種
gairaishu introduced species, non-native species, alien species
外来生物
gairaiseibutsu adventive species, non-native species, introduced species, alien species
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