The spelling of the word "most antidotal" can be explained using IPA phonetic transcription. The word starts with the sound /m/ followed by the vowel sound /əʊ/. The next sound is the consonant blend /st/ followed by the vowel sound /æ/. The final part of the word has the consonant sound /d/ followed by the vowel sound /əʊ/ and the consonant sound /təl/. Overall, the phonetic transcription for "most antidotal" is /məʊst æntidəʊtl/.