A thin skin, (S, M,) a substance that resembles the pellicle of the egg, (Lh, M, K,) that overspreads the surface of milk (Lh, S, M, K) and of broth (S, M) and of [the kind of pottage called] هَرِيسَة (Lh, M, K) and the like (K) when the wind blows upon it; (Lh, M, K;) as also ↓دِوَايَةٌ. (S, M, K.)