flat-earth·er
| \ ˌflat-ˈər-thər
\
\
variants:
or less commonly flat-earthist \
ˌflat-ˈər-thist
\
\
Definition of flat-earther
: a person who believes that the planet Earth is flat
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“Flat-earther.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flat-earther. Accessed 15 Apr. 2021.
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The first known use of flat-earther was in 1926
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