fetus
/ˈfiːtəs/( <英, 非技> 亦作foetus)
noun
(pl. fetuses)
- an unborn or unhatched offspring of a mammal, in particular, an unborn human more than eight weeks after conception（尤指怀孕八周以上的）胎儿; 胎。
USAGE
The spelling foetus has no etymological basis but is recorded from the 16th century and until recently was the standard British spelling in both technical and non-technical use. In technical usage fetus is now the standard spelling throughout the English-speaking world, but foetus is still found in British English outside technical contexts.
词源
late Middle English: from Latin fetus 'pregnancy, childbirth, offspring'.