The word "obeliad" refers to a book that contains obelisks, a type of ancient Egyptian symbol. Its spelling can be explained using IPA phonetic transcription: the first syllable is pronounced "oh" with an open-o vowel sound, followed by "be" with a short-e sound, and ending with "lee-ad" pronounced with a long-i sound and the consonant cluster "ad." Despite its specific meaning, the spelling and pronunciation of obeliad may be unfamiliar to many people outside of scholarly or historical circles.
Toward the obelion.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.