cryopreserved oocyte; frozen ovum
Medical and biological term for an egg cell that has been frozen for preservation, typically for fertility treatment or research.
In vitro fertilization using a cryopreserved oocyte was successful.
She is storing frozen ova in preparation for a future pregnancy.
凍結卵子 is a near-synonym also meaning 'frozen ovum'; 冷凍卵子 is more common in clinical contexts, while 凍結卵子 may appear in general or legal documents.
卵子凍結 refers to the process of oocyte cryopreservation itself, whereas 冷凍卵子 refers to the resulting frozen egg cell.
Compound of 冷凍 (reitō, 'freezing') and 卵子 (ranshi, 'ovum'). The term is a modern medical coinage reflecting advances in reproductive technology.