Hypertext Webster Gateway: "rima"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Rima \Ri"ma\, n.; pl. {Rim[ae]}. [L.] (Anat.)
A narrow and elongated aperture; a cleft; a fissure.
From WordNet (r) 1.7 (wn)
rima
n : a narrow elongated opening or fissure between two
symmetrical parts
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