The thing [or machine, a kind of drag,] with which wheat is thrashed, (S, M, Mgh, L, K,) by its being drawn over it (Mgh, L) repeatedly; called alsoجَرْجَرٌ (Mgh) [andنَوْرَجٌ, q. v.]; and so ↓مِدْوَاسٌ. (K.)
2.
(tropical:) A polishinginstrument; (S, K;) an instrument with which swords &c. are polished; (Msb;) a piece of wood upon which is aمِسَنّ [or polishing-stone], with which the sword is polished: (M:) plural مَدَاوِسُ. (S.)