Is “Ultimogeniture” a Scrabble word?
Yes
ULTIMOGENITURE
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Ultimogeniture
noun
1.A system of inheritance in which the youngest son or youngest child inherits an estate.