"Machilid" is an uncommon word that refers to a type of small, wingless insect. The spelling of this word can be explained using IPA phonetic transcription. The first syllable, "ma," is pronounced /mə/, with a schwa sound. The second syllable, "chil," is pronounced /kɪl/, with a short "i" sound. The final syllable, "id," is pronounced /ɪd/, with a short "i" sound followed by a voiced "d" sound. Therefore, the correct spelling for this word is "machilid."