ثط

أَثَطُّ ذ , and its fem. ثَطَّاآءُ: see ثَطٌّ, in four places. ― -b2- الثَّطَّاآءُ also signifies The spider: or another creeping thing, that stings, or bites, vehemently: (K:) this is from Lth, as in the O and L: but in the Tekmileh we find الثَّطَّاآءُ, like شَفَّاآء, [app. a mistake for الثِّطَاآءُ, like شِفَاآء,] a certain small creeping thing: or, as some say, it is الثَّطَا, of the measure of قَفًا. (TA.)