noun
immature ovum; immature egg
Medical and biological term for an egg cell that has not yet reached maturity.
未成熟卵は体外受精の際に培養されることがある。
Immature ova are sometimes cultured during in vitro fertilization.
成熟卵 refers to a mature ovum, while 未成熟卵 is an immature one.
Compound of 未成熟 (immature) + 卵 (egg/ovum).