protutor

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
PROTUTOR, civil law. He who not being the tutor of a pupil or minor, has 
administered his property or affairs as if he had been, whether he thought 
himself legally invested with the authority of a tutor, or not. 
     2. He who marries a woman who is tutrix, becomes, by the marriage, a 
protutor. The protutor is equally responsible as the tutor. 
    

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