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.
Full Definition of MONARCHY. 1. : undivided rule or absolute sovereignty by a single person. 2. : a nation or state having a monarchical government.3. : a government having a hereditary chief of state with life tenure and powers varying from nominal to absolute. See monarchy defined for English-language learners.efinition of MONARCHY for Kids. 1. : a state or country having a king or queen. 2. : a form of government headed by a king or queen.