لطح1 لَطَحَهُ, aor. ـَ (inf. n. لَطْحٌ, S,) He struck him with the palm of his hand; (K;) as also لَطَخَهُ: or he struck him, not violently, with his open hand: (TA:) or he struck him, not violently, with the palm of his hand and the like: (T:) or he struck him gently on the back (S, K) with the palm of the hand; like حَطَأَهُ. (S.) b2: لَطَحَ بِهِ He threw him, or cast him, upon the ground. (S, K.) لَطْحٌ A soil, or pollution, or taint, (like لَطْخٌ,) of which, when it is rubbed, there remains no sign. (T, M, K.)