Fetus

[преимущественно американский вариант английского языка]; смотри значение foetus

Большой англо-русский словарь

Fetus

noun Etymology: Middle English, from Latin, act of bearing young, offspring; akin to Latin fetus newly delivered, fruitful — more at feminine an unborn or unhatched vertebrate especially after attaining the basic structural plan of its kind; specifically a developing human from usually three months after conception to birth — compare embryo 1b

Merriam-Webster's Collegiate Dictionary