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plural rimae
(anatomy) A cleft or gap between two symmetrical parts, particularly between the vocal folds. examples
(astronomy) A crack or fissure on a lunar or planetary surface; a rille. quotations examples
Look for three prominent interior craters, as well as an ancient rima falling near the shadow's edge.
2006, Tammy Plotner, Jeff Barbour, What's Up 2006: 365 Days of Skywatching, page 128