mediatrix
[ mee-dee-ey-triks ]
/ ˌmi diˈeɪ trɪks /
noun, plural me·di·a·tri·ces [mee-dee-uh-trahy-seez, -ey-tri-seez] /ˌmi di əˈtraɪ siz, -ˈeɪ trɪˌsiz/, me·di·a·trix·es.
a woman who mediates, especially between parties at variance.
Also
me·di·a·tress,
me·di·a·trice
[mee-dee-ey-tris] /ˌmi diˈeɪ trɪs/.