The children were fascinated by the stegosaur fossil with bony plates on its back.

stegosaur 由 stego-（希腊词根，意为"覆盖"或"屋顶"）和 -saur（希腊词根，意为"蜥蜴"）组成，字面意思是"有覆盖物的蜥蜴"。 stegosaur 指"剑龙"，一种已灭绝的恐龙，其显著特征是背部有两排垂直排列的骨板。