Lewis & Short

con-cresco, crēvi, crētum, 3 (inf. perf. sync. concresse, Ov. M. 7, 416), v. n., to grow together; hence with the prevailing idea of uniting, and generally of soft or liquid substances which thicken; to harden, condense, curdle, stiffen, congeal, etc. (very freq., and class. in prose and poetry).

  1. I. Prop.: concrescunt semina (opp. extenuantur), Lucr. 4, 1261; 6, 626; cf.: concrescunt subitae currenti in flumine crustae, Verg. G. 3, 360; opp. liquere, Cic. Univ. 14: rigido concrescere rostro Ora videt, to stiffen into a hard beak. Ov. M. 5, 673; cf.: Aconteus Gorgone conspectā saxo concrevit oborto, id. ib. 5, 202 (cf. also saxoque oculorum induruit umor, id. ib. 5, 233): quo pacto pluvius concrescat in altis Nubibus umor, Lucr. 6, 495; cf. id. 6, 250: imbres gelidis concrescunt ventis, Ov. M. 9, 220: (aqua) neque conglaciaret frigoribus neque nive pruināque concresceret, etc., Cic. N. D. 2, 10, 26: gelidus concrevit frigore sanguis, Verg. A. 12, 905: cum lac concrevit, Col. 7, 8, 3; cf. Ov. M. 12, 436: concretos sanguine crines, stuck together or clotted, Verg. A. 2, 277; cf.: concreta sanguine barba, Ov. M. 14, 201.
    With in and acc.: crystalli modo glaciari et in lapidem concrescere, harden into, Plin. 36, 22, 45, § 161; cf.: aër … tum autem concretus in nubis cogitur, Cic. N. D. 2, 39, 101.
  2. II. Meton.
    1. A. To take form, to grow, increase: de terris terram concrescere parvis, Lucr. 1, 840: terrā in ipsā taetro concrescere odore bitumen, id. 6, 807; Verg. E. 6, 34; cf.: indagatio initiorum unde omnia orta, generata, concreta sint, Cic. Tusc. 5, 24, 69; 1, 24, 56: valles, quae fluminum alluvie et inundationibus concreverint, Col. 3, 11, 8.
      With ex: omne corpus aut aqua aut aër aut ignis aut terra est, aut id quod est concretum ex aliquā parte eorum, composed, formed of, Cic. N. D. 3, 12, 30; so id. ib. 3, 14, 34; Tac. A. 13, 57.
      1. 2. Trop.: illud funestum animal, ex nefariis stupris, ex civili cruore concretum (al. conceptum), Cic. Pis. 9, 21.
    2. B. (Con intens.) To grow strong, to rise by growing, etc. (so very rare): (lana) quanto prolixior in pecore concrescit, tanto, etc., Col. 7, 3, 10 (but in Lucr. 5, 833, the best reading is clarescit; v. Lachm.).
      Hence, concrētus, a, um, P. a. (acc. to I.), grown together, concrete, compound, condensed, hardened, thick, hard, stiff, curdled, congealed, clotted, etc. (class.): dubitare non possumus quin nihil sit animis admixtum, nihil concretum, nihil copulatum, nihil coagmentatum, nihil duplex, Cic. Tusc. 1, 29, 71; 1, 27, 66: aër crassus et concretus, id. ib. 1, 18, 42; Lucr. 1, 1018; 5, 467 sq.: aër (opp. fusus, extenuatus), Cic. N. D. 2, 39, 101; cf.: pingue et concretum esse caelum, id. Div. 1, 57, 130: umores (opp. acres), id. N. D. 2, 23, 59: spuma, Ov. M. 4, 537: lac, Verg. G. 3, 463: in sanguine, Ov. M. 13, 492: mare, Plin. 4, 16, 30, § 104: nix concreta pruinā, Lucr. 3, 20: concreta et durata glacies, Liv. 21, 36, 8; cf.: concreta frigora canā pruinā, stiffened by the hoary frost, Verg. G. 2, 376: gelu, Curt. 8, 4.
      Poet., of light: cum claram speciem concreto lumine luna abdidit, thick, i. e. dimmed, Cic. poët. Div. 1, 11, 18: nanus et ipse suos breviter concretus in artus, shortened, Prop. 4 (5), 8, 41: dolor, benumbing, tearless, Ov. P. 2, 11, 10.
      Subst.: concrētum, i, n., firm or solid matter: species quaedam deorum, quae nihil concreti habeat, nihil solidi, Cic. N. D. 1, 27, 75.
      Esp. (sc. gelu), hard or stiff frost: nec semine jacto Concretum patitur radicem adfigere terrae, Verg. G. 2, 318 Rib. Forbig.; cf. Hildebr. ad App. M. 1, p. 455. (By others concretum is made acc. of 2. concretus. The common reading is concretam, sc. gelu, the root stiffened by frost; cf. Forbig. ad loc.)
      Comp.: semen concretius, Lucr. 4, 1240: spuma lactis concretior, Plin. 11, 41, 96, § 239: ossa concreta, t. t., solid bones, i. e. without marrow, id. 7, 18, 18, § 78.
      Sup. and adv. not in use.