رُونَةٌ
2.
And Hardness, difficulty, or severity, of a thing, or an affair, or event; and grievousness thereof: so in the saying, كَشَفَ اللّٰهُ عَنْكَ رُونَةَ هٰذَا الأَمْرِ [May God remove from thee the hardness, &c., and the grievousness, of this thing, or affair, or event]. (M.) [See also رَوْنٌ.]
3.
And The utmost limit, reach, or degree, of a thing, in respect of heat, or cold, or in other respects, as when said of grief, or of war, or the like: and hence is said to be taken the name الرُّنَةُ [or رُنَةُ, without ال, (see الرُّنَّى, in article رن,) as though it were a contraction of رُونَة,] given to [the month] Jumádà-l-Ákhireh, because of its intense cold [when it was so named]. (TA.)