'Widow' in the Bible

Then Boaz said, “On the day you buy the field from the hand of Naomi, you must also acquire Ruth the Moabitess, the widow of the deceased, in order to raise up the name of the deceased on his inheritance.”

I will also acquire Ruth the Moabitess, Mahlon’s widow, as my wife, to perpetuate the deceased man’s name on his property, so that his name will not disappear among his relatives or from the gate of his home. You are witnesses today.”