Lewis & Short

rīma, ae, f. [for rigma, from rig, ringor; hence, that gapes, yawns],

  1. I. a cleft, crack, chink, fissure (cf. hiatus): angusta, Hor. Ep. 1, 7, 29: cava, Prop. 1, 16, 27: patet, Ov. M. 11, 515; cf. hiscit, Plin. 17, 14, 24, § 108: tabernae rimas agunt, are cracked, Cic. Att. 14, 9, 1; so, rimas agere, Ov. M. 2, 211; 10, 512; and in a like sense, ducere, id. ib. 4, 65: facere, to make, id. Tr. 2, 85: explere, to stop up, Cic, Or. 69, 231; cf.: nec te signata juvabunt Limina, persuasae fallere rima sat est, Prop. 4 (5), 1, 146.
      1. 2. = cunnus, Juv. 3, 97.
        Poet.: ignea rima micans, i. e. a flash of lightning (qs. cleaving the sky), Verg. A. 8, 392; imitated by Plin. 2, 43, 43, § 112.
  2. II. Transf., comically: plenus rimarum sum: hac atque hac perfluo, I am full of chinks, i. e. can keep nothing to myself, conceal nothing, Ter. Eun. 1, 2, 25 (opp. tacere, continere); Plaut. Curc. 4, 2, 24.