- The act of killing one's spouse, especially the murder of a husband by his wife.
- A woman who has killed her husband.
- The term mariticide is principally used to refer to the murder of a husband by his wife, rather than a general term for killing a spouse. The common term for the murder of a wife by her husband is uxoricide.
From Latin maritus (“married", "husband”) + --cide, from caedere (“to kill”)