A public speaker; one who delivers an oration; especially, one distinguished for his skill and power as a public speaker; one who is eloquent.

An officer who is the voice of the university upon all public occasions, who writes, reads, and records all letters of a public nature, presents, with an appropriate address, those persons on whom honorary degrees are to be conferred, and performs other like duties; -- called also public orator.

a good man who is skilled in speaking

an able speaker who likes to practise his speaking skills and may tend to talk for a long time

Someone who speaks eloquently in public.

Orator is an originally Latin word for (public) speaker.