viviparity
Biological term for the reproductive mode in which embryos develop inside the mother's body and are born live.
哺乳類は一般に胎生である。
Mammals are generally viviparous.
noun which may take the genitive case particle 'no'
viviparous; live-bearing
Adjectival use, often in compounds like 胎生動物 (viviparous animal).
胎生の魚も存在する。
There are also viviparous fish.
From 胎 (womb) + 生 (birth), a Sino-Japanese term for live birth.