Noun

(en noun)

A person with extensive knowledge or ability in a given subject.

* If an expert''' says it can't be done, get another '''expert . -

* {{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= Welcome to the plastisphere , passage=Plastics are energy-rich substances, which is why many of them burn so readily. Any organism that could unlock and use that energy would do well in the Anthropocene. Terrestrial bacteria and fungi which can manage this trick are already familiar to experts in the field.}}

(chess) A player ranking just below master.

Noun

(en noun)

A person who appraises the works of others.

* Macaulay

The opinion of the most skilful critics was, that nothing finer [than Goldsmith's Traveller ] had appeared in verse since the fourth book of the Dunciad.

A specialist in judging works of art.

One who criticizes; a person who finds fault.

* I. Watts

When an author has many beauties consistent with virtue, piety, and truth, let not little critics exalt themselves, and shower down their ill nature.

An opponent.

(an act of criticism)

* Alexander Pope

Make each day a critic on the last.

(the art of criticism)

* John Locke, An Essay Concerning Human Understanding, Chapter 21, page 550

And, perhaps, if they were distinctly weighed, and duly considered, they would afford us another sort of logic and critic , than what we have been hitherto acquainted with.