ثِنَايَةٌ

A cord, or rope, of goats' hair (شَعَر), or of wool, (S, K,) or of other material; (K;) as also ↓ ثِنَاءٌ (K) and ↓ مِثْنَاةٌ and ↓ مَثْنَاةٌ; (M, K;) which last is explained by IAar as signifying [simply] a cord, or rope: (M:) [or] the first has the meaning assigned to it above, voce ثِنَاءٌ; synonym with ثِنَايَانِ: and signifies also a long rope; whence the saying of Zuheyr, describing the [she-camel termed] سَانِيَة,

تَمْطُو الرِّشَاءَ وَتُجْرِى فِى ثِنَايَتِهَا

مِنَ المَحَالَةِ قَبًّا رَايءِدًا قَلِقَا

(T,) meaning [She draws the well-rope, and causes to run,] with her ثناية upon her, (ISk, T,) [a wabbling, unsteady, sheave (?) of the large pulley;] the ثناية here being a rope of which the two ends are tied to the saddle (قَتَب) of the سانية; the [upper] end of the well-rope being tied to its ↓ مِثْنَاة [which here means the folded middle part]: (T:) but Aboo-Sa'eed says that it [here] means a piece of wood by which are connected the two extremities of the cheeks, or side-pieces, (طرفا الميلين, [the latter of which words I here render conjecturally, supposing it to be similar in meaning to القَعْوِ or القَعْوَيْنِ,]) above the محالة, and a similar piece below; the محالة and [qu. or] the sheave turning between the tow pieces thus called. (T, in a later portion of the article)