Dower

DOWER – provision made from a husband’s estate for the support of his widow and family, usually one third of the value of the estate (real estate only)

Merriam-Webster Online Dictionary
dower (noun)
1.
the part of or interest in the real estate of a deceased husband given by law to his widow during her life - compare curtesy
2.
a) - dowry
b) - dowry
dower (verb)
transitive verb
to supply with a dower or dowry - endow