Disciform c is a term from the field of ophthalmology, which refers to a specific shape of the cornea. The spelling of this term is unique, and can be explained through its phonetic transcription. The first syllable "dis" is pronounced as /dɪs/, the second syllable "ci" is pronounced as /sɪ/, and the final syllable "form" is pronounced as /fɔːm/. Therefore, the word "disciform" is spelled with a combination of the letters "d", "i", "s", "c", "f", "o", "r", and "m" to match its phonetic pronunciation.