noun
Academic term for the study of or belief in improving the genetic quality of the human population.
優生学は、かつて一部の国で政策として採用された。
Eugenics was once adopted as a policy in some countries.
From 優生 (yūsei, 'superior birth') + 学 (-gaku, 'study'). The term is a calque of English 'eugenics'.