also: らんほう
noun
ovarian follicle
Anatomical term for the fluid-filled sac in the ovary that contains an immature egg.
超音波検査で卵胞の大きさを測ります。
We measure the size of the follicle with an ultrasound.
卵胞が十分に育ったら
Ovulation occurs when the follicle has matured sufficiently.
Compound of 卵 (egg) and 胞 (sac/cell), directly describing the anatomical structure.