طحن

طَحَّانٌ ذ [meaning A miller, or grinder of wheat and the like, ] is thus, perfectly decl., if you do not derive it from الطَّحُّ: (K, TA:) i. e. طَحَّان, if you derive it from الطَّحْنُ, is perfectly decl.; but if you derive it from الطَّحُّ, or from الطَّحَا which signifies “ the expanded tract of land, ” it is imperfectly decl.: (S, TA:) if from الطَّحُّ, it is of the measure فَعْلَانُ, not فَعَّالٌ; and if from الطَّحَا, it would be by rule طَحْوَانُ. (IB, TA.)