-ˌnād.ə(r), -ātə- noun
( -s )
Etymology: Middle English dominatoure, from Middle French dominateur, from Latin dominator, from dominatus (past participle of dominari to rule, govern) + -or — more at dominate
1. : a dominating person or power : ruler , master
2. obsolete : a planet or sign supposed in astrology to have a commanding influence
3. : a brightness receptor in the retina of the eye that is supposedly a group of cones linked to the terminals of a single nerve fiber