hollow earther

Etymology
From.

Noun

 * 1) Someone who believes the Earth is hollow.
 * 2) * 2001, F. Gwynplaine MacIntyre, Macintyre's Improbable Bestiary, Wildside Press, 24.
 * Beware the Hollow-Earther! Beware the troglodytes / They make their homes in catacombs, and prowl on moonless nights . . .