1. To remove the mythical elements (from a legend, cult, etc.); specifically, in theology, to reinterpret the mythological elements in the Bible.

In order to discover the real facts of Christ's life and teachings, it is necessary to strip the New Testament; especially, the Gospels, of this layer of mythology.

2. Etymology: from Latin de-, "reverse of" + Greek mythologein, "to relate legends, myths".