Wiktionary
mariticide
n. 1 The act of killing one's spouse, especially the murder of a husband by his wife. 2 A woman who has killed her husband.
Wikipedia
Mariticide
Mariticide (from Latin maritus "husband" + -cide, from caedere "to cut, to kill") literally means killing of one's husband. The killing of a wife is given the name uxoricide.
Usage examples of "mariticide".
In her name, not even matricide, parricide, fratricide, sororicide, filicide, mariticide, or other murders of near and distant kindred were wrong so long as these victims did not revere her.