גָּפְרִית

From LSJ

Ὅμηρον ἐξ Ὁμήρου σαφηνίζεινexplain Homer from Homer, explain Homer with Homer

Source

English (Strong)

probably feminine of גֹּ֫פֶר; properly, cypress- resin; by analogy, sulphur (as equally inflammable): brimstone.