emeritus
/ɪˈmerɪtəs/adjective
- (of the former holder of an office, especially a university professor) having retired but allowed to retain their title as an honour（前任公职者, 尤指大学教授）荣誉退职的, 退休后保留头衔的：
emeritus professor of microbiology
荣誉退休的微生物学教授
postpositive the National Gallery's director emeritus.荣誉退休的国家美术馆馆长。
词源
mid 18th cent.: from Latin, past participle of emereri 'earn one's discharge by service', from e- （variant of ex-） 'out of, from' + mereri 'earn'.