An Etymological Dictionary of Astronomy and Astrophysics

1. A person who gives or makes laws.
   

2. A member of a legislative body (Dictionary.com).

Etymology (EN): From L. legis lator “proposer of a law,” from legis, genitive of lex, → law, + lator “proposer,” agent noun of latus “borne, brought, carried.”

Etymology (PE): Qânungozâr, literally “he who places the law,” from qânun, → law, + gozâr, present stem and agent noun of gozâštan “to place, put; perform; allow, permit,” related to gozaštan “to pass, to cross,” → trans-