دِرْسٌ درس The relic, trace, or mark, of a thing that becomes effaced, erased, rased, or obliterated. (M.) ― -b2- (tropical:) An old and worn-out garment, or piece of cloth; (S, M, A, K;) [app. an epithet used as a subst.;] as also ↓ دَرْسٌ (M) and ↓ دَرِيسٌ ; (S, M, A, K;) ↓ which last also signifies an old and worn-out carpet; (A;) ↓ and as an epithet, signifying old and worn-out, is applied to a coat of mail, (M, TA,) and to a sword, and to a مِغْفَر [&c.]: (TA:) pl. [of the first] أَدْرَاسٌ, (M, K,) [a pl. of pauc.,] and [of the same or of either of the others] دِرْسَانٌ. (S, M, K.) ― -b3- [Hence, or, as IF says, from الحَيْض,] أَبُو أَدْرَاسٍ [in some copies of the K أُمُّ أَدْرَاسٍ] (tropical:) The pudendum muliebre. (S, O, K.)
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