Formyl teriodide is a chemical compound composed of carbon, hydrogen, and iodine. Its spelling may seem complicated, but it is pronounceable with the help of the IPA (International Phonetic Alphabet) phonetic transcription system. The word begins with /fɔːmɪl/, which sounds like "FOR-mill." The second part, /tɛrɪoʊdaɪd/, can be pronounced as "TEAR-ee-oh-dyed." The final syllable "ide," as in many chemical compounds, is pronounced as "IED." Knowing the phonetic transcription can make spelling any scientific term less daunting.
Iodoform.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.