# flat-earther

> English word · Noun

## Definitions
1. A person who believes or advocates the claim that the planet Earth is flat.
2. A person who believes or advocates an outlandish, discredited theory; a person who refuses to acknowledge the truth despite overwhelming evidence.

## Etymology
From flat-earth + -er.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/flat-earther