This noun is uncertain but possibly means scorching heat, burning, or fury. BDB suggests it may relate to Arabic words for thirst and internal heat, describing a scorching glow. The word appears in Isaiah's vision of the Lord striking the River (Euphrates) and drying it up. The phrase might mean 'with the scorching of His breath' or 'with the fury of His breath,' though textual issues make the exact reading uncertain. Some suggest emending it to 'with the strength of' or 'with the might of.' The context describes God's powerful breath creating a wind so strong it dries up the river, enabling His people to cross as they did the Red Sea. Whether 'scorching' or 'strength,' the sense is of overwhelming divine power manifested in breath or wind.