رون1 رَانَ, [aor. ـُ inf. n. رَوْنٌ It (an affair, or event,) was, or became, hard, difficult, or severe. (TA.) b2:  And رَانَتْ لَيْلَتُنَا Our night was, or became, very cloudy and hot. (Th, M, TA.) A2:  See also رَانَ in art. رين.رَوْنٌ, (so accord. to a copy of the T, [if correct, an inf. n. used as a simple subst., see above, first sentence,]) or ↓ رُونٌ, (so in another copy of the T, and accord. to the K,) with damm, (K,) Hardness, difficulty, severity, vehemence, or intenseness: (T, K:) pl. رُؤُونٌ, (T, and so in a copy of the K,) or رُؤُونٌ. (CK.) [See also رُونَةٌ.]A2: رَوْنٌ signifies [or signifies also] The furthest part of a مَشَارَة [q. v.]. (Yoo, K.) رُونٌ: see the next preceding paragraph.رُونَةٌ The greater, main, principal, or chief, part of a thing. (M, K.) b2:  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.] b3:  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 art. 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.) أَرْوَنَانٌ: see the opinions of IAar and Sb respecting its derivation in art. رن. [It is said in the S and K in art. نبج, that there is no word like it except أَنْبَجَانٌ.] You say يَوْمٌ أَرْوَنَانٌ (T, S, M, K) and ↓ أَرْوُنَانِىٌّ, (S, M,) and لَيْلَةٌ أَرْوَنَانَةٌ (T, S, M, K) and ↓ أَرْوَنَانِيَّةٌ, (M,) A day, and a night, hard, difficult, severe, distressing, or grievous: (S, K, * TA:) or vehemently hot and grievous: (T, TA:) or that has reached the utmost point, or degree, in respect of joy, or grief, or heat: or hard, difficult, or severe, in respect of everything; in respect of heat, or cold, or clamour, cries, shouts, or noises [&c.]. (M, TA.) Yousay also يَوْمُ أَرْوَنَانٍ, [virtually] meaning the same: (K:) [or this may mean A day of clamour, &c.; as will be seen from what follows.] ↓ يَوْمُ أَرْوَنَانِىoccurs at the end of a verse of a rájiz: this may be [by poetic license] for يَوْمُ أَرْوَنَانٍ, or for يَوْمُأَرْوَانَانِىٍّ: and ↓ يَوْمٌ أَرْوَنَانِى occurs at the end of a verse of En-Nábighah El-Jaadee, for يَوْمٌ أَرْوَنَانِىٌّ. (S.) Accord. to Sh, as is said in the T, (TA,) يَوْمٌ أَرْوَنَانٌ, (K, TA,) as also يَوْمُ أَرْوَنَانٍ, (K,) signifies A day that is easy, (K, TA,) or pleasant: (TA:) thus having two contr. meanings: (K:) and Sh cited a verse of En-Nábighah ElJaadee as an ex.: but AHeyth disallowed ارونان as having any other meaning than grief, and difficulty or the like; and he disallowed also the verse cited by Sh [as being an ex. of the meaning that he assigned to it]. (TA.) b2:  Also A voice, or sound: (S, K:) and cries, shouts, or noises, and clamour. (TA. [In one place, in the TA, رون, thus written, without any vowel-sign, has also this latter meaning assigned to it: but the context seems to show that this is a mistranscription.]) أَرْوَنَانِىٌّ; and its fem., with ة; and أَرْوَنَانِى: see the next preceding paragraph, in four places.هُوَ مَرُونٌ بِهِ He is overcome, subdued, or subjected. (K.) [مَرُونٌ here is a contraction of مَرْوُونٌ, from رَانَ having for its aor. ـُ as a dial. var. of رَانَ having for its aor. ـِ see art. رين.]