/ ˌmɔːgəˈnætɪk; NAmE ˌmɔːrg-/ adjective
( technical ) ( of a marriage ) in which the title or possessions of the partner who has higher social rank will not be passed on to the other partner, or to their children
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WORD ORIGIN
early 18th cent.: from modern Latin morganaticus , from medieval Latin matrimonium ad morganaticam marriage with a morning gift (because a morning gift, given by a husband to his wife on the morning after the marriage, was the wife's sole entitlement in a marriage of this kind).