noun (plural fetuses)
- An unborn offspring of a mammal, in particular an unborn human baby more than eight weeks after conception.More example sentences
embryo, unborn baby/child
- A small subset of fetuses with large lung lesions will become hydropic, deteriorate rapidly, and die in utero.
- Feedback is currently being used in a trial of early versus delayed delivery for preterm, growth retarded fetuses.
- How well a woman and the fetus do during pregnancy depends upon the type of heart problem.
late Middle English: from Latin, 'pregnancy, childbirth, offspring'.
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 nontechnical use. In technical usage, fetus is now the standard spelling throughout the English-speaking world.