en.wiktionary.orghollow earther - Wiktionary, the free dictionary Contents From Wiktionary, the free dictionary From hollow + earth + -er. hollow earther (plural hollow earthers) Someone who believes the Earth is hollow. 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 . . . Categories: English compound termsEnglish terms suffixed with -er (ideology)English lemmasEnglish nounsEnglish countable nounsEnglish multiword termsen:Conspiracy theoriesen:Pseudoscience