شثشَثٌّ A species of tree, (As, IDrd, ISd, Msb,) of those that grow upon the mountains, (As,) or a certain plant, (S, K,) of sweet odour, (S, Msb, K,) but bitter to the taste, (S, Msb,) with which one tans, (S, K,) growing in the mountains of El-Ghowr (ADk, Msb) and Tihámeh and Nejd; (ADk;) a kind of tree like the dwarf-apple-tree, (AHn, Mgh,) in size, (AHn,) the leaves of which are like those of the خِلَاف [q. v.], (AHn, Mgh,) and are used for tanning therewith, (Mgh,) without thorns, and having a small rose-coloured  [fruit of the kind called] بَرَمَة, in which are three or four black grains, resembling the شِينِيز [q. v.], which, when scattered, are eaten by the pigeons: n. un. with ة. (AHn:) the word occurs in a trad. as the name of a tan: Az says that it is a mistake for شَبّ, though he knew not whether the شَثّ were used for tanning, or not: (TA:) [Mtr, however, says that] شِبّ is a mistake in this case, for it is a species of زَاج, and is a dye, not a tan: (Mgh:) accord. to some, (TA,) the شَثّ is the wild nut (جَوْزُ البَرِّ). (K [in which this last is mentioned as a distinct signification] and TA.) [See also شَبٌّ.]A2:  The honey-bee. (AA, K.) A3: A broken portion of the head of a mountain, remaining in a form like the [kind of acroterial ornament of a wall called] شُرْفَة: pl. شِثَاثٌ. (K.) A4:  Also Many, or much, of anything. (TA.)