u·ter·us 
(ytər-əs)
(ytər-əs)n. pl. u·ter·i (ytə-rī′) or u·ter·us·es
1. A hollow muscular organ located in the pelvic cavity of female mammals in which the fertilized egg implants and develops. Also called womb.
2. A corresponding part in other animals.
[Middle English, from Latin.]