flat-earther

noun
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

First Known Use of flat-earther

1926, in the meaning defined above

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The first known use of flat-earther was in 1926

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