فَأْوٌ

An interval, (S, M,) or a low, or depressed, place, (خَفْض, so in one of my copies of the S,) between two mountains: (S, M:) and, according to Lh, (M,) a cleft (M, K) in a mountain, (M,) or between two mountains. (K.) And A وَطْء [or depressed tract], (M, and so in copies of the K,) or وَطِىْء, (so in other copies of the K,) meaning soft, or smooth, or plain, place, (TA,) between two stony tracts of the kind whereof one is termed حَرَّة. (M, K.) And, (M, K,) as some say, (M,) A clear, open, space among sands. (M, K.) And, (M, K,) according to As, (M,) A low, or depressed, tract of good land surrounded by mountains, (M, K,) and such as is of an elongated form, and such as is not of that form. (M.) And (as some say, TA) A narrow place in a valley, leading to a wide space, (K, TA,) of which the upper part has no place of exit. (TA.) And (as some say, TA) A smooth place. (K, TA.)

Also The night; (M, K;) so says Aboo-Leylà but of questionable correctness. (M.)

And The place, or time, of sunset. (K.)