viviparity
Biological term for the reproductive mode in which embryos develop inside the mother's body and are born live.
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).
There are also viviparous fish.
From 胎 (womb) + 生 (birth), a Sino-Japanese term for live birth.