WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
an unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal
Word Usage
"The position held above in the comments that a foetus is just a set of cells and not a person is refuted with a consideration of simple geography: compare a 7-month premature baby kept alive in an incubator, with a 7-month "foetus" in the womb."