The teacher referred me to the library for that reference book.

referred 是动词 refer 的过去式。refer 由前缀 re-（表示"再次"或"回"）和词根 fer（来自拉丁语 ferre，意为"携带"）组成，字面意思是"带回去"或"转交"。在句中 refer to 表示"让某人去某处获取信息或帮助"，即"指引、推荐"的意思。