วิทยาศาตรดุษฎีบัณฑิต ภาษาอังกฤษ

Etymology tree Proto-Indo-European *deḱ- Proto-Indo-European *-yeti Proto-Indo-European *-éyeti Proto-Indo-European *doḱ-éye-ti Proto-Italic *dokejō Proto-Italic *dokeō Ancient Greek διδάσκω (didáskō)sl. Latin doceō Proto-Indo-European *-tōr Proto-Italic *-tōr Latin -tor Latin doctorbor. Old French doctur Anglo-Norman doctourder. Middle English doctour English doctor From Middle English doctor, doctour (“an expert, authority on a subject”), from Anglo-Norman doctour, from Latin doctor (“teacher”), from doceō (“to teach”). Displaced native Middle English lerare (“doctor, teacher”) (from Middle English leren (“to teach, instruct”) from Old English lǣran, lēran (“to teach, instruct, guide”), compare Old English lārēow (“teacher, master”)). Displaced Old English lǣċe (“doctor, physician”).