The Collaborative International Dictionary of English v.0.48:
Uxoricide \Ux*or"i*cide\, n. [L. uxor wife + caedere to kill.] [1913 Webster] 1. The murder of a wife by her husband. [1913 Webster] 2. One who murders his wife. [1913 Webster]WordNet (r) 3.0 (2006):
uxoricide n 1: a husband who murders his wife 2: the murder of a wife by her husband