צָרַע

From LSJ

Κύριε, βοήθησον τὸν δοῦλον σου Νῖλον κτλ. → Lord, help your slave Nilos ... (mosaic inscription from 4th-cent. church in the Negev)

Source

English (Strong)

a primitive root; to scourge, i.e. (intransitive and figurative) to be stricken with leprosy: leper, leprous.