Summary
Tefnut is the goddess of moisture, rain, and dew. Born from Atum alongside Shu (her brother), she represents the wet principle that balances his dryness. Together Shu and Tefnut = air + moisture = the conditions for life. She is sometimes identified with the eye of Ra. (المصدر: raw/egyptian/إعادة_قراءة_الأساطير_المصرية.md)
Linguistic Root
Semitic etymology: From root implying moisture or wetness. Tefnut = the wet counter to Shu's dry. (المصدر: raw/egyptian/قراءة_سامية_للميثولوجيا_المصرية.md)