Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One who stubbornly adheres to outmoded or discredited ideas.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A person who believes or advocates the theory that the earth is flat.
  • noun idiomatic, by extension A person who believes or advocates an outlandish, discredited theory; a person who refuses to acknowledge the truth despite overwhelming evidence.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From the long-discredited belief that the earth is flat.]

Examples

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