医 is a bound morpheme (bound form) meaning 'medical, medicine, to cure'. It cannot be used alone as a free word; instead, it appears as the first or second element in compound words such as 医生 (doctor), 医院 (hospital), 医学 (medical science), 医疗 (medical treatment), and 中医 (traditional Chinese medicine). In some contexts, it can also function as a verb meaning 'to cure' (e.g., 医病), but it is still considered a bound form.