سطح

سَطْحٌ ذ a word of well-known meaning; (S;) The upper, or uppermost, part [or surface ] of a house or chamber &c.; (Msb;) [the flat top or roof of a house &c.;] the back (ظَهْر) of a house or chamber (K, TA) when it is flat, level, or even; because of its expansion: (TA:) and the upper, or uppermost, part [or surface ] of anything: (K:) or it has this last meaning [primarily]: and hence the سَطْح of a house or chamber: (A:) pl. سُطُوحٌ. (Msb, TA.) ― -b2- [In geometry, A plane; i. e.] the سَطْح is that which is divisible in length and breadth and is terminated by a line [or lines ]. (KT.)