multiple pregnancy; multiple birth
Medical term covering pregnancy with more than one fetus, as well as the resulting birth of multiples (twins, triplets, etc.).
Multiple pregnancy carries higher risks than singleton pregnancy.
She experienced a multiple birth and gave birth to twins.
multiple birth; childbirth resulting in twins, triplets, etc.
multiple pregnancy; polycyesis
Compound of 多 (many) and 胎 (womb/fetus), directly meaning 'multiple fetuses'. A straightforward Sino-Japanese medical term.