The spelling of the word "holyhedron" can be easily explained using IPA phonetic transcription. The first syllable "ho" is pronounced with the short "o" sound, while the second syllable "ly" is pronounced with the long "i" sound. The third syllable "he" has a silent "h" and is pronounced with the short "e" sound. The fourth syllable "dr" is pronounced with a soft "d" sound and a rolling "r". The final syllable "on" is pronounced with the short "o" sound. Holyhedron is a term used to describe a sacred 12-sided geometric figure.