Step-Father
Defined in 2 dictionaries — Bouvier (1914), Black's (1910)
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
The husband of one’s mother by virtue of a marriage subsequent to that of which the person spoken of is the offspring. x of which the person spoken of is the offspring.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Tbe man who marries a widow, she having a child by her former marriage, is step-father to Buch chlld.