How Do You Spell DYESS?
Pronunciation: [dˈa͡ɪs] (IPA) 
The spelling of "dyess" can seem confusing, but it can be explained using IPA phonetic transcription. The word is pronounced /daɪs/. The "d" is pronounced like the English "d," and the "y" sounds like the grapheme "i." The sound represented by "ess" is spelled with two graphemes, "e" and "ss," but it is actually a single sound, an unvoiced sibilant. So, the word is spelled with a "y" instead of an "i" because the vowel sound in the word is closer to the sound of "y."
