As the fog lifted, the distant mountain peak suddenly materialized before our eyes.

materialized 是动词 materialize 的过去式，由名词 material（物质）加上动词后缀 -ize（使...化）构成，字面意思是"使物质化"。在这里引申为"突然显现、变得清晰可见"，形容原本模糊的山峰在雾气散去后突然变得清晰可见的过程。