رين

رَيْنٌ ذ , originally an inf. n.: (Msb:) Rust that overspreads the sword and the mirror; (M;) rust that overspreads a polished thing: (Er-Rághib, TA:) or much dirtiness from rust: or simply dirt, filth, soil, or pollution: syn. طَبَعٌ and ذَنَسٌ: (S, K: [in a copy of the S, and in the CK, الطَّبْعُ is erroneously put for الطَّبَعُ:]) or a cover, or covering. (Msb.) [And hence,] The like of rust, covering the heart: (Zj, T:) black- ness of the heart: pl. رِيَانٌ. (T.) And ↓ رَانٌ signifies the same as رَيْنٌ. (TA.)