Meaning

noun a long narrow natural elevation or striation

noun any long raised strip

noun a long narrow natural elevation on the floor of the ocean

originFrom Middle English rigge, rygge, (also rig, ryg, rug), from Old English hryċġ (“back, spine, ridge, elevated surface”), from Proto-West Germanic *hrugi, from Proto-Germanic *hrugjaz (“back”), from Proto-Indo-European *(s)krewk-, *(s)ker- (“to turn, bend”). Cognate with Scots rig (“back, spine, ridge”), North Frisian reg (“back”), West Frisian rêch (“back”), Dutch rug (“back, ridge”), German…

Etymology from Wiktionary, CC BY-SA 3.0