Lewis & Short

rēnes, renum (renium, Plin. 21, 29, 103, § 175; 28, 8, 27, §§ 98 and 102; Scrib. Comp. 125; 143.
Sing. rēn, not used.
Collat. form rien, Plaut. ap. Fest. p. 276 Müll.; cf. Charis. p. 24 P.; Prisc. p. 645 P.), m. [φρένες; cf. Lid. and Scott, s. v. φρήν].

  1. I. The kidneys, reins, Cels. 4, 1, 10; Plin. 11, 37, 81, § 206: renum vitia, id. 23, 7, 63, § 121; Plaut. Curc. 2, 1, 21: umores, qui ex renibus profunduntur, Cic. N. D. 2, 55, 137; id. Tusc. 2, 25, 60: renes morbo temptantur acuto, Hor. S. 2, 3, 163; id. Ep. 1, 6, 28 al.
    1. * B. The loins: accingere, Vulg. Exod. 12, 11; id. Dan. 10, 5: canis, Nemes. Cyn. 112.
  2. II. Trop. (eccl. Lat.), the seat of the affections, Vulg. Psa. 138, 12; id. Apoc. 2, 23.