'Rima' definitions:

Definition of 'rima'

(from WordNet)
noun
A narrow elongated opening or fissure between two symmetrical parts

Definition of 'Rima'

From: GCIDE
  • Rima \Ri"ma\, n.; pl. Rimae. [L.] (Anat.) A narrow and elongated aperture; a cleft; a fissure. [1913 Webster]