The doctor diagnosed her with dissociative disorder, as she often couldn't recall important events.

dissociative 是动词 dissociate 的形容词形式，由前缀 dis-（表示"分离、分开"）和词根 sociate（来自拉丁语 sociare，意为"连接、联合"）组成。字面意思是"分离的、解离的"。 dissociative disorder 指"解离性障碍"，是一种心理疾病，表现为记忆、意识或身份认同的暂时性分离状态。