a testis that fails to move into the scrotum as the male fetus develops; "undescended testicles have an increased risk for cancer" 男の胎児が発達する際、陰嚢に入れない睾丸。
日/英 »
【上位】 one of the two male reproductive glands that produce spermatozoa and secrete androgens; "she kicked him in the balls and got away" 男性の2つの生殖腺。
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