materfamilias
Concise Oxford English Dictionary © 2008 Oxford University Press:
materfamilias /ˌmeɪtəfəˈmɪlɪas/
▶noun (pl. matresfamilias /ˌmeɪtiːz-/) the female head of a family or household.
– origin L., from mater ‘mother’ + familias, old genitive form of familia ‘family’.
'materfamilias' also found in these Oxford entries:

