The correct spelling of the word "tilidate" is "t-i-l-t-a-d-e." The "d" in the second syllable is pronounced like a "t," which explains why some may spell it with a "t" instead. The IPA phonetic transcription for this word is /ˈtɪl.tə.deɪt/. It is important to use the correct spelling when discussing this medication, as misspelling could lead to confusion or potential errors in prescribing or administering it.