in geology, "unconsolidated rocky material covering bedrock," 1897, from Latinized form of Greek rhēgos "rug, blanket" (from PIE *reg- (3) "to dye;" see raga) + lithos "stone" (see litho-).
Entries linking to regolith
raga n.
in Indian music, a melodic framework for improvised melodies, 1788, from Sanskrit raga-s "harmony, melody, mode in music," literally "color, mood," related to rajyati "it is dyed," from PIE *reg- (3) "to dye" (source also of Greek rhegos "blanket, rug").
litho-
before vowels, lith-, word-forming element meaning "stone, rock;" from Greek lithos "stone, a precious stone, marble; a piece on a game board," a word of unknown origin.