flat-earther
noun
- person who actively promotes the idea that the Earth is flat
Wiktionary
noun
Etymology: Etymology tree English flat-earth Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English flat-earther From flat-earth + -er.
- A person who believes or advocates the claim that the planet Earth is flat.
“His commitment to remaining a flat-earther seems to be strengthened by counterarguments rather than weakened by them.”
- A person who believes or advocates an outlandish, discredited theory; a person who refuses to acknowledge the truth despite overwhelming evidence.
“2008, Bob Sweere, "Voice of the Day: Global warming? Yes," News-Leader.com (Missouri), 16 Jun. (retrieved 1 July 2008), Global warming is settled, unless you are a flat earther or an energy company apologist.”
“When it comes to vaccine safety, they are diehard flat-earthers: the microchips and mercury are articles of faith.”