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lībra, ae, f. [cf. λίτρα; root cli-, clino], the Roman pound, of twelve ounces: as erat libra pondus, Varr. L. L. 5, § 169 Müll.: coronam auream libram pondo ex publica pecunia in Capitolio Iovi donum posuit, Liv. 4, 20: mulli binas libras ponderis raro exsuperant, Plin. 9, 17, 30, § 64: expende Hannibalem, quot libras in duce summo invenies? Juv. 10, 147: neque argenti in convivio plus pondo quam libras centum inlaturos, Gell. 2, 24, 2: dipondii pondo duas erant libras, Gai. Inst. 1, 122.

  • II. Transf.
    1. A. A measure for liquids: frumenti denos modios et totidem olei libras, Suet. Caes. 38.
  • B.
    1. 1. A balance, pair of scales: cum in alteram librae lancem animi bona imponebat, in alteram corporis, etc., Cic. Tusc. 5, 17, 51; cf. id. Fin. 5, 30, 91.
      1. 2. A water-poise, plummet-level, level, line: sin autem locus … pari libra cum aequore maris est, Col. 8, 17, 4: libratur autem dioptris aut libris aquariis aut chorobate, Vitr. 8, 6, 1.
        Hence, ad libram: alteram navem pluribus aggressus navibus in quibus ad libram fecerat turres, of equal height or of equal weight, Caes. B. C. 3, 40, 1.
      2. 3. Counterpoise, balance: contra flatus quoque pervicax libra Bononiensibus calamis, Plin. 16, 36, 65, § 161: aes et libra, v. aes.
      3. 4. The constellation Libra, The Balance, Verg. G. 1, 208; Ov. F. 4, 386; Plin. 18, 25, 59, § 221: felix aequato genitus sub pondere Librae, Manil. 4, 545.
      4. 5. Trop., a balance (poet.), Pers. 4, 10: animi cunctantis libra, Claud. Laud. Stil. 1, 75.

    lībrālis, e, adj. [libra], of or containing a pound, of a pound weight: pondus, Plin. 19, 2, 11, § 34: offae, Col. 6, 2, 7: veluti asses librales erant, Gai. Inst. 1, 122.

    • lībrāmen, ĭnis, n. [libro], a balance, poise (late Lat.).
    Trop.: judicii, Claud. Mam. Stat. Anim. 3, 13.

    lībrāmentum, i, n. [libro], that which gives to any thing a downward pressure; weight, gravity.

    1. I. Lit.: plumbi, Liv. 42, 63, 4.
      1. B. A fall, descent of water: libramentum aquae, Plin. 31, 6, 31, § 57: quod libramentum cum exinanitum est, suscitat et elicit fontem, cum repletum, moratur et strangulat, of a spring that alternately rises and falls, Plin. Ep. 4, 30, 10: inferiore labro demisso ad libramentum modicae aquae receptae in fauces, palpitante ibi lingua ululatus elicitur, of the croaking of frogs, Plin. 11, 37, 65, § 173.
    2. II. Transf.
      1. A. A level surface, horizontal plane: extremitatem et quasi libramentum, in quo nulla omnino crassitudo sit, * Cic. Ac. 2, 36, 116: sub eodem libramento stare, Sen. Q. N. 1, 12, 1: usque ad libramentum summi fornicis, Ael. Gall. ap. Paul. ex Fest. p. 206 Müll.
      2. B. Evenness, equality: ventorum hiemalium et aestivorum, Col. 1, 5, 8
      3. C. A straight line: si recto libramento inter solem terrasque media (luna) successit, Sen. Ben. 5, 6, 4: libramentum finale, a boundary line, Amm. 15, 4, 4.
      4. D. A weight for balancing or giving motive power (ballista): ferrea manus cum injecta prorae esset, gravique libramento plumbi recelleret ad solum, Liv. 24, 34, 10: arietem admotum nunc saxis ingentibus nunc libramento plumbi gravatum ad terram urguebant, id. 42, 63, 4 Weissenb.: late cladem intulisset, ni duo milites vincla ac libramenta tormento abscidissent, Tac. H. 3, 23.

    lĭbrārĭa, ae, f., v. 1. librarius, II., and 2. librarius, II. B.

    lĭbrārĭŏlus, i, m. dim. [2. librarius], a copyist, transcriber; a scribe, secretary, Cic. Att. 4, 4, 6; id. Balb. 6, 14: ex librariolis Latinis, id. Leg. 1, 2, 7.

    lĭbrārĭum, v. 2. librarius, II. C.

    1. lībrārĭus, a, um, adj. [libra].

    1. I. Of or containing a pound, of a pound weight (post-Aug.): frusta, Col. 12, 53, 4: as, Gell. 20, 1, 31.
    2. II. Subst.
      1. A. lībrārĭus, ii, m., a weight, the sixteenth part of a modius, = sextarius: sextarius aequus aequo cum librario siet, sexdecimque librarii in modio sient, Plebisc. ap. Paul. ex Fest. p. 246 Müll.
      2. B. lībrārĭa, ae, f., she that weighed out the wool to the female slaves, a forewoman, head-spinner, called also lanipendia, Juv. 6, 475 (by others referred to 2. librarius); Inscr. Orell. 4212.

    2. lĭbrārĭus, a, um, adj. [3. liber],

    1. I. of or belonging to books: scriba librarius, a copyist, transcriber of books, Varr. R. R. 3, 2, 14; Cic. Agr. 2, 13, 32: libraria taberna, a bookseller’s shop, Cic. Phil. 2, 9, 21: scriptor, a transcriber of books, Hor. A. P. 354: atramentum, ink for writing books, Plin. 27, 7, 28, § 52.
      Hence,
    2. II. Subst.
      1. A. lĭ-brārĭus, i, m.
        1. 1. A transcriber of books, a copyist, scribe, secretary, Cic. Agr. 2, 5, 13: librum ut tuis librariis daret, id. Att. 12, 40, 1: librarii mendum, Liv. 38, 55, 8: legionis, the secretary of the legion, Inscr. ap. Grut. 365, 1; cf. Sen. Contr. 1, 7, 18; Juv. 9, 109.
        2. 2. A bookseller, Sen. Ben. 7, 6, 1; Gell. 5, 4, 2; 18, 4, 1; Sulp. Sev. Dial. 1, 23, 4.
        3. 3. (Sc. doctor.) An elementary teacher, Hier. Ep. 107, 4.
      2. B. lĭbrārĭa, ae, f.
        1. 1. A female scribe: (Parcae) utpote librariae Superum archivumque custodes, Mart. Cap. 1, § 65 (perh. also Juv. 6, 476; cf. sub 1. librarius).
        2. 2. A bookseller’s shop; in libraria, ego et Julius Paulus poëta consederamus, Gell. 5, 4, 1: quispiam in libraria sedens, id. 13, 30, 1.
      3. C. lĭbrārĭum, ii, n., a place to keep books in, a bookcase, bookchest: exhibe librarium illud legum vestrarum, Cic. Mil. 12, 33: libraria omnia exurerent, Amm. 29, 2, 4.

    lībrātē, adv., v. libro, P. a. fin.

    lībrātĭo, ōnis, f. [libro].

    1. I. A making level, levelling: fortasse qui Archimedis libros legit, dicet non posse fieri veram ex aqua librationem, Vitr. 8, 6, 3.
    2. II. A horizontal position, level: circa terrae librationem, Vitr. 6, 1, 5.
    3. III. A hurling off, hurling, slinging, Diom. p. 473 P.

    lībrātor, ōris, m. [libro].

    1. I. A leveller, esp. by means of a water-level, a surveyor, Cato, R. R. 22, 1; Front. Aquaed. 105: superest ut tu libratorem vel architectum mittas, qui diligenter exploret, sitne lacus altior mari, Plin. Ep. 10, 50, 3.
    2. II. One who throws or hurls weapons by hand (cf. funditor, a slinger): funditores libratoresque excutere tela et proturbare hostem jubet, Tac. A. 2, 20: libratoribus funditoribusque attributus locus, id. ib. 13, 39; Inscr. ap. Kellerm. Vigil. p. 55, n. 127.

    lībrātūra, ae, f. [libro], a making even: cutis, Veg. 2, 22, 3.

    lībrātus, a, um, Part. and P. a., from libro.

    lībro, āvi, ātum, 1, v. a. [libra].

    1. I. To balance, make even, level, to determine a level: aquam, to level water, i. e. to ascertain the fall of water by means of a level, Vitr. 8, 6, 3: collocationem libratam indicare, id 8, 6, 1.
      Pass. impers.: libratur autem dioptris, Vitr. 8, 6, 1.
      1. B. Transf., to make even or level: pavimenta, Cato, R. R. 18, 7.
    2. II. To hold in equilibrium, to poise, balance: terra librata ponderibus, Cic. Tusc. 5, 24, 69: columnarum turbines ita librati perpenderunt, ut puero circumagente tornarentur, Plin. 36, 13, 19, § 91: librati pondera caeli orbe tene medio, Luc. 1, 58.
      1. B. To cause to hang or swing, to keep suspended, keep in its place: vela cadunt primo et dubia librantur ab aura, are waved to and fro, Ov. F. 3, 585: et fluctus supra, vento librante, pependit, Sil. 17, 274: aëris vi suspensam librari medio spatio tellurem, Plin. 2, 5, 4, § 10.
      2. C. To cause to swing, to swing, sway, brandish, set in motion, hurl, dash, cast, launch, fling, throw: summā telum librabat ab aure, Verg. A. 9, 417: ferro praefixum robur, id. ib. 10, 479: caestus, id. ib. 5, 478: tum librat ab aure intorquens jaculum, Sil. 5, 576: dextra libratum fulmen ab aure misit, Ov. M. 2, 311; 5, 624; 7, 787; Luc. 3, 433: librata cum sederit glans, Liv. 38, 29: librare se, to balance or poise one’s self, to fly: cursum in aëre, Ov. Am. 2, 6, 11: saepe lapillos Tollunt; his sese per inania nubila librant, Verg. G. 4, 196: haliaeetos librans ex alto sese, Plin. 10, 3, 3, § 8: corpus in herba, to stretch one’s self out on the grass, Ov. F. 1, 429: incidentis manus libratur artifici temperamento, Plin. 12, 25, 54, § 115: librare iter, to take one’s way, Sen. Oed. 899.
    3. III. Trop.
      1. A. To make of even weight, to balance, make equal (poet.): orbem horis, Col. 10, 42: crimina in antithetis, Pers. 1, 85.
      2. B. To weigh, ponder, consider (poet. and in post-class. prose): librabat metus, Stat. Th. 9, 165: quae omnia meritorum momenta perpendit, librat, examinat, Naz. Pan. ad Const. 7: praescriptiones, Cod. Th. 8, 4, 26.
        Hence, lībrātus, a, um, P. a.
      1. A. Level, horizontal: aquam non esse libratam, sed sphaeroides habere schema, Vitr. 8, 6.
      2. B. Poised, balanced, swung, hurled, launched; forcible, powerful: librata cum sederit (glans), Liv. 38, 29: librato magis et certo ictu, violent, powerful, Tac. H. 2, 22: malleus dextra libratus ab aure, Ov. M. 2, 624: per nubes aquila librata volatu, Sil. 15, 429.
        Comp.: libratior ictus, Liv. 30, 10; cf. id. 42, 65.
        Hence, * adv.: lībrātē, deliberately: aliquid eligere, Serv. Verg. A. 2, 713.