The spelling of the word "Quartridge" follows the English language's complex orthographic conventions. It is pronounced as /kwɔː(r)tɪdʒ/ using the International Phonetic Alphabet. The "qu" at the beginning is used to represent the sound /kw/, while the following "a" represents the vowel sound /ɔː/. The "rt" is pronounced as /rt/ and the "i" represents the short vowel sound /ɪ/. Finally, the "dge" ending is used to represent the sound /dʒ/. Despite its non-phonemic spelling, "Quartridge" is still a valid English word.