ETYMOLOGY
from French berseaux (cradle) + –trix a feminine ending
EXAMPLE
“…High rewards, as was then customary, were bestowed on the messenger who attended the child, and on the bersatrix who rocked the cradle of the infant hero…”
From: A History of the Life of Edward the Black Prince,
By George Payne Rainsford James, 1836
Lexicophilia 