for the purposes of this online document, let
ã = long "a", as in "pay"
õ = long "o", as in "toe"

morganatic (môr“ge-nąt“îk) adjective
Of or being a legal marriage between a person of royal or noble birth and a partner of lower rank, in which it is agreed that no titles or estates of the royal or noble partner are to be shared by the partner of inferior rank nor by any of the offspring of the marriage.

[New Latin morganãticus, from Medieval Latin (mãtrimõnium ad) morganãticam, (marriage for the) morning-gift, of Germanic origin.]
- mor“ganat“ically adverb

Excerpted from The American Heritage® Dictionary of the English Language, Third Edition © 1996 by Houghton Mifflin Company.