10 letters · 15 points in Scrabble
adjective (of marriages) of a marriage between one of royal or noble birth and one of lower rank; valid but with the understanding that the rank of the inferior remains unchanged and offspring do not succeed to
originFrom New Latin morganāticus, from the Medieval Latin phrase mātrimōnium ad morganāticum, from Proto-Germanic *murgnagebō (“morning gift”) (whence Old English morgenġiefu).
Etymology from Wiktionary, CC BY-SA 3.0