The simian crease is one of the listed signs in Down Syndrome which would imply there's some genetic factor at play. My eldest daughter has a simian crease on one hand and the other hand is 'normal'.
Sovereign definition, a monarch; a king, queen, or other supreme ruler. See more.
Webster Dictionary(1.00 / 1 vote)Rate this definition: Royalty(noun) the state of being royal; the condition or quality of a royal person; kingship; kingly office; sovereignty. Royalty(noun) the person of a king or sovereign; majesty; as, in the presence of royalty.