The sight of spoiled food brought a look of disgust to her face.

disgust 是名词，由前缀 dis-（表示"否定、相反"）和词根 gust（来自拉丁语 gustare，意为"品尝"）组成，字面意思是"不喜欢尝的味道"，引申为"厌恶、反感"的情绪。