An Etymological Dictionary of the German Language/Annotated/Griebs

Griebs, neuter, ‘core of fruit,’ from the equivalent Middle High German grobiȥ, grübiȥ (also ‘larynx’), to which the dialectic variants Middle High German grütz (gürbsi), Modern High German Gretzen, are akin. Old High German *grobaȥ and *grubiȥ are wanting; in form they are connected with Old High German obaȥ, ‘fruit,’ with Middle High German ebiȥ, ebitz, ‘core of fruit,’ and with Modern High German Butzen, as well as Swiss böki.