In Roman law. A member of the senatus. In old English law . A member of the royal council; a king’s councillor. In American law . One who is a member of a senate, either of the United States or of a state. Senatores sunt partes corporis regis. Senators are part of the body of the king. Staundef. 72, E.; 4 Inst 53, in marg.
Black’s Law Online Dictionary
