noun
also foe·tus ˈfēd.əs, -ētəs
( plural fetuses also foetuses or foe·ti ˈfēˌtī)
Etymology: Latin, action of bearing young, offspring, fetus, from fetus, foetus, adjective, pregnant, fruitful, newly delivered — more at feminine
: an unborn or unhatched young vertebrate especially after passing through the earliest developmental stages and attaining the basic structural plan of its kind ; specifically : a developing human from usually three months after conception to birth — compare embryo