jasper UK /ˈd͡ʒæs.pə/US /ˈd͡ʒæs.pɚ/noun 6verb 1forms 3 noun6 •An opaque, impure variety of quartz, of red, yellow, and other dull colors, breaking conchoidally with a smooth surface. •(US, slang) A person, a guy, especially seen as naïve or simple.And list'nin to some big out-a-town jasper / Hearin' him tell about horse-race gamblin' / Not a wholesome trottin' race, no! — 1957 •Jasperware pottery. •(UK, informal) A wasp. •(Appalachia) A stranger. •(no longer used) Any bright-coloured kind of chalcedony apart from cornelian. verb1 •To decorate with, or as if with, jasper. formsjaspered · jaspering · jaspers