The word "oidiomycetic" is a mouthful to say, but it's actually quite simple to spell once you break it down using IPA phonetic transcription. The first syllable, "oi," sounds like the diphthong in "joy." The next syllable is "dio," which is pronounced like "dee-oh." The third syllable, "myc," sounds like "mike." The final syllable, "etic," is pronounced "eh-tik." So, when you put it all together, "oidiomycetic" is spelled /ɔɪdi-oʊ-maɪ-sɛt-ɪk/.
Relating to oidiomycetes.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.