رثأ1 رَثَأَ, (S, M, K,) aor. ـَ (M, K,) inf. n. رَثْءٌ, (S, M,) He drew milk from the udder upon sour milk, so that it thickened, (S, K,) and became what is termed رَثِيْئَة: (K:) or he mixed fresh milk with sour milk: or, as some say, he made milk to become what is termed رَثِيْئَة: (M:) or it has this last signification, and also signifies he mixed [in an absolute sense]. (K.) [Az says,] I heard an Arab of the desert, of Benoo-Mudarris, say to a servant of his, اِرْثَأْ لِى لُبَيْنَةً أَشْرَبُهَا [Mix thou for me a little milk so as to make رَثِيْئَة, which I will drink]. (T.) And you say, رَثَأَ القَوْمَ (M, K) and رَثَأَ لَهُمْ (M) He made for the party رَثِيْئَة. (M, K.) b2:  [Hence,] هُمْ يَرْثَؤُونَ رَأْيَهُمْ, (S,) and رَثَؤُوا رَأْيَهُمْ, (M,) inf. n. as above, (assumed tropical:)  They  confuse, or confound, and they confused, or confounded, their judgment, or opinion. (S, M. [See also 8.]) b3:  And [hence also, perhaps, as رثيئة is said to be beaten with a مِجْدَح in the mixing of it,] He beat (K) with a staff, or stick. (TA.) A2:  It (anger) became stilled, or appeased. (K.) A3:  He (a camel) became affected with the disease termed رَثْأَة. (K.) A4:  Also, (M, K,) inf. n. as above, (M,) a dial. var. of رَثَى, meaning He eulogized a man after his death [in verse or otherwise; or he wept for him, or over him, enumerating his good qualities or actions]: (M, K: *) and in like manner one says of a woman eulogizing her husband after his death; inf. n. مَرْثِئَةٌ: (M:) ISk mentions an Arab woman's  saying رَثَأْتُ زَوْجِى بِأَبْيَاتٍ [I eulogized my husband after his death with verses]; pronouncing the verb with ء; but it is originally without ء: (S, Sgh:) Fr says that her doing this arose from her finding them to say رَثَأْتُ اللَّبَنَ and her therefore supposing المَرْثِيَة to be from the same source: (TA in the present art.:) or, accord. to Fr, their chasteness of speech sometimes induced them to pronounce with ء that which is [properly] without ء; and thus they said رَثَأْتُ المَيِّتَ and لَبَّأْتُ بِالحَجِّ and حَلَّأْتُ السَّوِيقَ. (TA in art. رثو.) 4 أَرْثَاَ see the next paragraph.8 ارتثأ It (milk) thickened, or became thick: (S, K:) and so ↓ ارثأ, (M, K,) in some one or more of the dialects. (M.) b2:  [Hence,] ارتثأعَلَيْهِمْ أَمْرُهُمْ (assumed tropical:)  Their case, or affair, became confused to them. (S, M.) And ارتثأ فِى رَأْيِهِ (assumed tropical:)  He made a confusion in his judgment, or opinion. (S, K.) And هُمْ يَرْتَثِئُونَ أَمْرَهُمْ (assumed tropical:)  [app. for فِىأَمْرِهِمْ, and thus meaning They are confused, or they make a confusion, in their case, or affair: or, otherwise, they confuse their case, or affair]: from الرَّثِيْئَة; (T, TA;) and if so, tropical. (TA.) A2:  Also He drank what is termed رَثِيْئَة. (T, K.) رَثْءٌ: see رَثْأَةٌ.رُثْءٌ: see رُثْأَةٌ.رَثْأَةٌ, (M, TA,) or ↓ رَثْءٌ, (K, [probably a mistranscription,]) (assumed tropical:)  Littleness of intelligence or sagacity: (M, K:) and (assumed tropical:)  weakness of heart: (M, TA:) and (assumed tropical:)  foolishness, or stupidity; (K;) and so ↓ رَثِيْئَةٌ (Th, M, K) and ↓ مَرْثَأٌ. (TA in art. وأب.) b2:  Hence, perhaps, (TA,) the first of these words (رَثْأَةٌ) signifies [also] (assumed tropical:)  A certain disease in a camel's shoulder-joint, (K,) in consequence of which he limps. (TA.) رُثْأَةٌ, (M, TA,) or ↓ رُثْءٌ, (K, [probably a mistranscription,]) Blackness mixed with speckles of white; or the reverse: syn. رُقْطَةٌ. (M, K.) رَثِيْئَةٌ Sour milk upon which fresh milk is drawn from the udder, so that it becomes thick: (Lh, S, M, K:) or fresh milk poured upon sour, (As, T, M, Mgh,) and then stirred about with a [wooden instrument called] مِجْدَح until it becomes thick: (Lh, M:) or fresh milk upon which sour milk is poured, then left a while, whereupon thin yellow water [or whey] comes forth, and is poured away from it, and then the thick is drunk. (Har p. 451.) One says, الرَّثِيْئَةُ تَفْثَأُ الغَضَبَ (S, TA) What is termed رثيئة stills, or appeases, anger: (TA:) alluding to [the effect produced by] a small kindness: a saying which originated from a man's being incensed against some persons. and being hungry, and their giving him to drink some رثيئة, whereupon his anger became appeased: (S in art. فثأ:) hence it became a proverb. (TA.) A2:  See also رَثْأَةٌ.أَرْثَأُ, fem. رَثْآءُ, A ram, and a ewe, black speckled with white; or the reverse: syn. أَرْقَطُ, and رَقْطَآءُ. (M, K.) مَرْثَأٌ: see رَثْأَةٌ.مَرْثُوْءٌ (assumed tropical:)  A man weak-hearted, and of little intelligence or sagacity. (M.) [See also مَرْثُوٌّ, in art. رثو.]