Duenna
Duenna , noun
[Sp. dueña, doña, from Latin domina. See Dame.]
1.
The chief lady in waiting on the queen of Spain. — Brande
2.
An elderly lady holding a station between a governess and companion, and appointed to have charge over the younger ladies in a Spanish or a Portuguese family. — Brande & C
3.
Any old woman who is employed to guard a younger one; a governess. — Arbuthnot