gruff (adj.)youdaoicibaDictYouDict
1530s, of physical things, "coarse, coarse-grained," from Middle Dutch or Middle Low German grof "coarse (in quality), thick, large," of uncertain origin, regarded by some as related to Old English hreof, Old Norse hrjufr "rough, scabby," with Germanic completive prefix ga-. Of manners, "rough, surly," by 1690s. Related: Gruffness.
psephiteyoudaoicibaDictYouDict
"A coarse-grained breccia, conglomerate, or similar sedimentary rock; (in later use) specifically such a rock after metamorphic alteration", Early 19th cent.; earliest use found in Henry Thomas De la Beche (1796–1855), geologist. From ancient Greek ψῆϕος pebble, round stone + -ite, after French psêfite.