درس1 دَرَسَ, aor. ـُ inf. n. دُرُوسٌ, It (a trace, or mark, or what is termed رَسْمٌ, S, A, K, and a house, A, or a thing, M) became effaced, erased, rased, or obliterated; (S, M, A, K;) as also ↓ اندرس, (K, TA,) said of what is termed رسم: (TA:) or it (the trace, or mark, of a house; or what remained, cleaving to the ground, marking the place of a house;) became covered with sand and dust blown over it by the wind: (TA in art. دثر:) or it (an abode, or a place of sojourning,) became  effaced, erased, rased, or obliterated, and its traces, or remains, became concealed, or unseen: (Msb:) and دَرُسَ signifies the same as دَرَسَ in the first of the senses explained above, but in an intensive manner. (M.) b2:  [Hence الآيَاتُ ↓ دَارَسَتِ as explained near the end of this paragraph.] b3: Hence, also, (AHeyth,) دَرَسَ الثَّوْبِ, (AHeyth, S, A, K,) inf. n. دَرْسٌ, (S, TA,) (tropical:)  The garment, or piece of cloth, became old and worn out. (AHeyth, S, A, K.) b4:  And دَرَسَ الكِتَابُ (assumed tropical:)  The writing, or book, became old. (Msb.) b5:  [Hence, also,] دَرَسَتْ, (S, M, A, K,) aor. ـُ (M,) inf. n. دُرُوسٌ (S, M, K) and دَرْسٌ, (M, K,) (tropical:)  She (a woman, S, M, A, K, or, accord. to Lh, a girl, M) menstruated. (S, M, A, K.) A2:  دَرَسَتْهُ الرِّيحُ, (S, M, K,) or الرِّيَاحُ, (A,) [aor. ـُ inf. n. دَرْسٌ, (A, TA,) The wind, (S, M, K,) or winds, (A,) effaced, erased, rased, or obliterated, it, (S, M, A, K,) by repeatedly passing over it; (A;) namely, a trace, or mark, [of a house &c.,] or what is termed رَسْمٌ; (S, K;) and [erased, or rased,] a house; (A;) or a thing: (M:) and دَرَسَهُ القَوْمُ The people effaced, erased, rased, or obliterated, it. (M.) b2:  Hence, (AHeyth,) دَرَسَ الثَّوْبَ, (AHeyth, K,) aor. ـُ inf. n. دَرْسٌ, (TA,) (tropical:)  He rendered the garment, or piece of cloth, old and worn-out. (AHeyth, K.) b3:  دَرَسَ الطَّعَامَ, (M,) or الحِنْطَةَ, (S, A, Msb, K,) وَنَحْوَهَا, (Msb,) aor. ـُ (TA,) inf. n. دَرْسٌ (M, K) and دِرَاسٌ, (S, A, Msb, K,) (tropical:)  He trod, or thrashed, the wheat, (S, M, A, Msb, K,) and the like: (Msb:) [because he who does so passes repeatedly over it:] of the dial. of El-Yemen: (M, TA:) or دِرَاسٌ in the sense here indicated is of the dial. of Syria. (TA.) b4:  دَرَسَ المَرْأَةَ, (A,) or الجَارِيَةَ, (K,) (tropical:)  He compressed the woman, (A,) or the girl. (K.) b5:  دَرَسَ النَّاقَةَ, (M, A,) aor. ـُ inf. n. دَرْسٌ, (M,) (tropical:)  He broke, or trained, the she-camel: (M, A:) [and so, app., ↓ دَارَسَهَا; for it is said that] the primary signification of مُدَارَسَةٌ is the breaking, or training, or disciplining, [a beast;] and returning time after time (تَعَهُّدٌ) to a thing. (TA.) You say also, بَعِيرٌ لَمْ يُدْرَسُ, meaning (tropical:)  A camel that has not been ridden. (S, TA.) b6: Hence, (M,) [or from دَرَسَتْهُ الرِّيحُ, or from دَرَسَ الثَّوْبَ,] دَرَسَ الكِتَابَ, (S, M, A, K,) aor. ـِ (M, K) and دَرِسَ, (K,) inf. n. دَرْسٌ and دِرَاسَةٌ (S, M, K) and دَرَاسَةٌ and دِرَاسٌ, (TA,) (tropical:)  He read the book; (M, K;) as though he opposed it until it became easy for him to remember it: (M:) or he read it repeatedly, [or studied it,] in order to remember it: (A:) or he made it easy to remember, by much reading: (TA:) or he read and learned it: (Bd in vi. 105:) and ↓ دَارَسَهُ, inf. n. مُدَارَسَةٌ and دِرَاسٌ, signifies the same: (M:) and so ↓ دَرَسَّهُ, and ↓ أَدْرَسَهُ: (K:) or the former of the last two has an intensive signification: the latter of them is mentioned by IJ: (TA:) [but accord. to the M, it is said by IJ that both of these are doubly trans., and have a different signification, which is also indicated in the A as that of the former of them: see 2:] الكُتُبَ ↓ دَارَسَتْ, and ↓ تَدَارَسْتُهَا, and ↓ اِدَّارَسْتُهَا, signify the same as دَرَسْتُهَا [I read the books, or read them repeatedly, &c.]: (S, TA:) and القُرْآنَ ↓ تَدَارَسَ signifies He read the Kur-án, and returned to it time after time, in order that he might not forget it. (TA.) Yousay also, دَرَسْتُ العِلْمَ, aor. ـُ inf. n. دَرْسٌ and دِرَاسَةٌ, (tropical:)  I read science. (Msb.) It is said in the Kur [vi. 105], accord. to different reading, وَلِيَقُولُوا دَرَسْتَ, and ↓ دَارَسْتَ, (tropical:)  [And to the end that they may say, Thou hast read, &c.:] but some say that the former means Thou hast read the books of the people of the Scriptures: and the latter, Thou hast consulted, or conferred, with them; expl. by ذَاكَرْتُهُمْ: (M:) or the former means Thou hast learned: (Abu-l-'Abbás:) and the latter, Thou hast read, or studied, under the Jews as thy teachers, and they have read, or studied, under thee as their teacher: (I'Ab, Mujáhid, K:) and another reading is ↓ دَارَسَ; i. e. دَارَسَ النَّبِىُّ اليَهُودَ [he prophet hath read, or studied, with the Jews] : and another, ↓ دَارَسَتْ, which may be rendered in two ways: The Jews have read, or studied, or consulted, or conferred, with (دَارَسَتْ) Mohammad: and The signs (آيَات) have vied in length of time [or antiquity] with  those of other scriptures so that every one of them has for the most part become obliterated: (TA:) and another reading is دَرَسَتْ; and another, دَرُسَتْ; both meaning, They (these stories, or histories,) have become obliterated: (M:) or they are things which have long since passed: (Abu-l-' Abbás:) but the latter of these two verbs has a more intensive signification: and it is also said to signify They have been dissipated. (M.) [You also say, دَرَسَ عَلَيْهِ (tropical:)  He read, or studied, under him as his teacher; like قَرَأَ عَلَيْهِ.]2 دَرَّسَ غَيْرَهُ (tropical:)  [He made another to read, or to read repeatedly, or to study, in order to remember; or to read and learn: he taught him to read, &c.: he lectured him]. (A.) And دَرَّسْتُهُ الكِتَابَ and إِيَّاهُ ↓ أَدْرَسْتُهُ (tropical:)  [I made him, or taught him, to read the book, or to read it repeatedly, or to study it, or to read and learn it]. (IJ, M.) b2:  See also دَرَسَ الكِتَابَ.3 دَارَسَتِ الآيَاتُ: see 1.A2:  دارس النَّاقَةَ: see 1. b2:  دارس غَيْرَهُ (tropical:)  [He read, or studied, with another, each of them teaching the other]. (A.) and دَارَسْتُهُ الكِتَابَ, inf. n. مُدَارَسَةٌ, (tropical:)  [I read, or read repeatedly, or studied, or read and learned, with him the book, each of us teaching the other]. (A.) And دَارَسَهُمْ (assumed tropical:)  He called to mind with them a subject of discourse, &c.; or he conferred with them; syn. ذَاكَرَهُمْ. (M.) See also 1, latter half, in five places.4 أَدْرَسَ see 2: b2:  and see دَرَسَ الكِتَابَ.5 تَدَرَّسْتُ أَدْرَاسًا وَتَشَمَّلْتُ شِمَالًا (tropical:)  [app., I clad myself in old and worn-out garments, and wrapped myself in shemlehs]. (A, TA.) 6 تَدَارَسُوا الكِتَابَ حَتَّى حَفِظُوهُ (tropical:)  [They read the book, or read it repeatedly, or studied it, or read and learned it, together, teaching one another, until they retained it in memory]. (A.) b2:  تَدَارَسْتُ الكُتُبَ, and اِدَّارَسْتُهَا, and تَدَارَسَ القُرْآنَ: see دَرَسَ الكِتَابَ.7 إِنْدَرَسَ see 1, first signification.دَرْسٌ A road, or way, that is unapparent; (S, K;) as though the traces thereof had become effaced. (TA.) b2:  See also دِرْسٌ.A2:  [A lecture: pl دُرُوسٌ.]دِرْسٌ 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.) دُرْسَةٌ (assumed tropical:)  Training, or discipline. (K.) دَرِيسٌ: see دِرْسٌ, in three places. b2:  [Also Dry بِرْسِيم, or Alexandrian trefoil.]رَبْعٌ دَارِسٌ [A house of which the remains are becoming effaced, erased, rased, or obliterated: or i. q. رَبْعٌ مَدْرُوسٌ]. (A.) b2:  اِمْرَأَةٌ دَارِسٌ, (M, K,) or, accord. to Lh, جَارِيَةٌ دَارِسٌ, (M,) (tropical:)  A woman, (M, K,) or girl, (Lh, K,) menstruating: (Lh, M, K:) pl. دُرَّسٌ and دَوَارِسُ. (M.) أَبُو إِدْرِيسَ (tropical:)  The penis. (A, K.) تَدْرِيسٌ [inf. n. of 2, q. v.]A2:  [Also (assumed tropical:)  A conventional term or signification used by the مُدَرِّسُون, or lecturers, tutors, or professors, of colleges]. (Mgh, in arts. حنف and دين, &c.) مِدْرَسٌ (assumed tropical:)  A book, or writing: (K, TA: but omitted in some copies of the former:) [also, accord. to Golius, a commentary by which any one is taught; Heber.מִדְרשׁ.] b2:  See also the next paragraph.مَدْرَسَةٌ (tropical:)  A place of reading, or study; (Msb;) in which persons read, or study; (TA;) [a college, a collegiate mosque; an academy;] as also ↓ مِدْرَسٌ (TA) and ↓ مِدْرَاسٌ; (M, K;) the measure of which last, [as well as that of the next preceding word,] as that of a n. of place, is strange: (ISd, TA:) whence the ↓ مِدْرَاس of the Jews; (K;) their house in which is repeatedly read the Book of the Law revealed to Moses: (A:) or their house in which the Book of God is read, or read repeatedly: (TA:) or their synagogue: (Msb:) the pl. of مدرسة is مَدَارِسُ; (TA;) and that of مدارس is مَدَارِيسُ. (Msb.) b2:  مَدْرَسَةُ النَّعَمِ (tropical:)  The road or track (طَرِيق) [of camels, or of camels and sheep or goats]. (A, TA.) مُدَرَّسٌ (tropical:)  A bed made plain, even, smooth, or easy to lie upon. (TA.) b2:  (tropical:)  A man tried and proved, or tried and strengthened, by use, practice, or experience; expert, or experienced. (A, TS, K.) مُدَرِّسٌ (tropical:)  A man who reads much and repeatedly. (K, TA.) b2:  Hence, the مُدَرِّس of مَدْرَسَة (tropical:)  [i. e. The lecturer, tutor, or professor, of a college, a collegiate mosque, or an academy: from which it is not to be understood that there is but one such person to every college; for generally one college has several مُدَرِّسُون]. (TA.) مِدْرَاسٌ: see مَدْرَسَةٌ, in two places. b2: Also (tropical:)  One who reads, or reads repeatedly, or studies, the books of the Jews: the measure of the word implies intensiveness. (TA.) رَبْعٌ مَدْرُوسٌ [A house of which the remains are effaced, erased, rased, or obliterated: see also دَارِسٌ]. (A.) b2:  طَرِيقٌ مَدْرُوسٌ (tropical:)  A road much beaten by passengers, so as to be made easy by them. (A, TA.) مُدَارِسٌ (tropical:)  One who reads, or studies, with another; syn. مُقَارِئٌ: (K:) or one who has read books. (K.)