الفَرْسَةُ

, (IAar, S, M, O, K, TA,) or ↓ الفِرْسَةُ, (M, TA,) the former according to A'Obeyd, (M, TA,) or, according to A'Obeyd, it is with ص, and the vulgar, he says, pronounce it with س, (O,) Gibbosity [of the back]; synonym الحَدَبُ: (IAar, O, TA:) or, (M, O, K, TA,) as also الفَرْصَةُ, (M, O,) which latter is the more approved in this sense, (M,) the رِيح [or flatus] of gibbosity; (M, O, K, TA;) [i. e.] the ريح that renders gibbous; (M;) as though it were breaking, or crushing so as to break, the back (كَأَنَّهَا تَفْرِسُ الظَّهْرَ أَىْ تَدُقُّهُ), and cleaving it (تَفْرِصُهُ أَىْ تَشُقُّهُ): (O:) [or الفَرْسَةُ signifies the displacement of one of the vertebræ; for,] according to As, one says أَصَابَتْهُ فَرْسَةٌ when one of the vertebræ of one's back has become displaced; but the flatus (الرِّيحُ) from which gibbosity results is termed الفَرْصَةُ, with ص: (TA:) or الفَرْسَةُ signifies a flatus that attacks in the neck, and breaks it: (S:) or, as some say, an imposthume, or ulcer, (قَرْحَة,) that is in the neck, breaking it: (M:) or a breach (فُرْجَة) in the neck; thus says AZ: or a breach (فرجة) that is in [the case of] gibbosity: the plural is فَرَسَاتٌ, not أَفْرِسَةٌ, which latter is said to be a plural of فَرْسَةٌ, but is anomalous. (TA.)