سُبَدٌ

A certain bird, (S, M, K,) having plumage so soft, or smooth, that when two drops of water drop upon it, (S, M, * K,) upon its back, (S, M,) they run off from it; (S, * M, K, * TA;) or such that when a drop of water drops upon its back, it runs [off] (M:) the Arabs liken to it a horse when he sweats: (S:) or a certain bird like the eagle: (TA:) or the male eagle: (M, TA:) or the swallow of the desert (خُطَّاف بَرِّىّ): (As, TA:) or a bird like the خُطَّاف; when water falls upon it, it runs off from it quickly: so says Aboo-Nasr; and so Skr in his Expos. of the poetry of Hudheyl, on the authority of As: (TA:) said by As to be a certain black bird: (so in a marg. note in one of my copies of the S:) plural سِبْدَانٌ. (S, M.)

Also A piece of cloth with which the watering-trough (K, TA) such as is termed مَرْكُوّ [q. v.] (TA) is rendered close, or firm, [in its bottom and sides,] (يُسَدُّ, [in the L يُسْبَدُ, but I know not any apposite meaning of this verb,]) in order that the water may not become turbid: (K:) it is spread therein; and the camels are made to drink [the water] above it. (L.)