| foetus | <biology, embryology, obstetrics> A developing unborn offspring of an animal that gives birth to its young (as opposed to laying eggs). From approximately three months after conception the offspring take on a recognisable form (all parts in place, etc.). In human development, the period after the seventh or eighth week of pregnancy is the foetal period. (12 Nov 1997) |
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| foetus in fetu | Condition in which a small, imperfectly formed foetus is contained within a foetus. (05 Mar 2000) |
| foetus papyraceus | One of twin foetus's that has died and been pressed flat against the uterine wall by the growth of the living foetus. (05 Mar 2000) |
| foetus sanguinolentis | Dead foetus that has become macerated. (05 Mar 2000) |