observātor, ōris, m. [observo],
a watcher, observer (perh. not ante-Aug.): nemo observator, nemo castigator assistet, Plin. Pan. 40: observator et custos bonorum, Sen. Ep. 41, 2: Catholicae legis, i. e. one who obeys it , Cod. Th. 16, 5, 1.
·noun One who makes a remark. II. Observator ·noun One who observes or takes notice. ...
Webster's Dictionary of the English Language