سِنْخٌ

The أَصْل [i. e. origin, source, root, foundation, &c.,] (JK, S, Msb, K) of anything: (JK, Msb, TA:) as also سِنْحٌ: (L:) plural [of pauc.] أَسْنَاخٌ (L, Msb) and [of mult.] سُنُوخٌ. (L.) One says, رَجَعَ فُلَانٌ إِلَى سِنْخِ الكَرَمِ [apparently meaning Such a one traced back his lineage to an ancestor who was the origin, or source, of generosity or nobility: or such a one returned, or reverted, to the original state, or condition, of generosity: the latter I think the more probable, as it is immediately added], and إِلَى سِنْخِهِ الخَبِيثِ [which seems to mean, to his bad original state]. (L.) And it is said in a tradition, أَصْلُ الجِهَادِ وَسِنْخُهُ الرِّبَاطُ فِى سَبِيلِ اللّٰهِ i. e. المُرَابَطَةُ عَلَيْهِ [meaning The very essence of fighting against unbelievers, and the first principle thereof, is constancy, or perseverance, or assiduity, in the way, or cause, of God]. (L.)

Also The place of growth (مَنْبِت) [i. e. the socket] of a tooth: (K:) or the part of a tooth that enters into the flesh [of the gum]; (Zj in his “ Khalk el-Insán; ”) [i. e.] the أَسْنَاخ of the teeth, (S,) or of the central incisors, (Msb,) are the roots thereof (أُصُولُهَا). (S, Msb.)

And [The tongue, or tang, of a blade;] the part of a knife, and of a sword, that enters into, or is inserted in, the handle: and the part of an arrow-head that enters into, or is inserted in, the head of the shaft. (L.)

And The paroxysm of a fever. (K.)

أَسْنَاخُ النُّجُومِ, according to IAar, as is related by Th, means The stars that do not make their [temporary] abode in the Mansions of the Moon, which [latter] are called نُجُومُ الأَخْذِ: ISd says, I am not sure whether he mean the أُصُول [a term applied to the seven, or five, planets], or others: some say, [and so IAar is stated in the TA in article شيخ to have said,] that they are called only أَشْيَاخُ النُّجُومِ [q. v.]. (L, TA. *)