A husband was a male spouse in a marital relationship.
Jason Kane was Bernice Summerfield's husband (PROSE: Happy Endings) for some time, but they eventually divorced. (PROSE: Eternity Weeps)
Rory Williams became Amy Pond's husband in 2010. (TV: The Big Bang) They remained together even after being permanently sent back to 1938 by a Weeping Angel. Thus, much of their married life occurred before their actual wedding. (TV: The Angels Take Manhattan)
River Song had at least three husbands: the Doctor (TV: The Wedding of River Song), Hydroflax and Ramone (TV: The Husbands of River Song).