What does the sentence "어는날 토끼의 가늘 먹으면 병이 낫는다는 의원의 말에 용왕님은 거북이를 불렀습니다" mean?
I kind of already know what the sentence means, but i specifically want to know what the word 의원의 means in this sentence and how it is pronounced.

And how exactly do you pronounce it in this sentence? Euiwon-i or Euiwon-e?

의원의 말 could be translated to "words of a doctor"