Fetus has 2 different meanings across 1 category:
Noun
an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal
"The ultrasound clearly showed that the fetus had developed all the main recognizable features of a human baby."
An unborn or unhatched vertebrate showing signs of the mature animal.
"The ultrasound revealed that the fetus had begun to move its limbs, clearly displaying the structure of a human baby."