The doctor described her symptoms as a typical allergic reaction.

described 是动词 describe 的过去式，describe 的意思是"描述、形容"。这个词由前缀 de-（表示"向下、完全"）和词根 scribe（来自拉丁语，意为"写"）组成，字面意思是"详细写下"，引申为"描述"。