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Wordnet 3.0

NOUN (1)

1. a narrow elongated opening or fissure between two symmetrical parts;


The Collaborative International Dictionary of English v.0.48:

Rima \Ri"ma\, n.; pl. Rimae. [L.] (Anat.) A narrow and elongated aperture; a cleft; a fissure. [1913 Webster]
WordNet (r) 3.0 (2006):

rima n 1: a narrow elongated opening or fissure between two symmetrical parts