Žarnov je praveký ručný kamenný mlynček na obilie. Žarnov pozostával zo sady dvoch mlecích kameňov tvaru valcovitých diskov. Spodný kameň - ležiak bol pevný. Horný kameň - behúň bol na spodný kameň zabrúsený a na ležiaku sa otáčal pozdĺž osového čapu. Mlynček sa roztáčal ručne, pomocou dreveného kolíka zasadeného do otvoru na obvode behúňa. Najstaršie žarnovy nemajú otvor pre kolík a predpokladá sa preto, že boli roztáčané pomocou remeňa alebo povrazu upevneného na obvode behúňa. Obilie sa do mlynčeka sypalo stredovým otvorom v behúni, okolo čapu, ktorý nevyplňoval celý priestor otvoru v behúni.

Žarnov is a prehistoric hand-made stone grain mill. Žarnov consisted of a set of two grinding stones in the shape of cylindrical wheels. The bottom stone - the lager was solid. Upper stone - the tread was ground to the lower stone and rotated along the axle pin on the lager. The grinder was rotated manually by a wooden pin inserted into a hole in the circumference of the tread. The oldest seals do not have a pin hole and are therefore assumed to have been spun by a belt or rope attached to the circumference of the tread. The grain was poured into the grinder through a central hole in the tread, around a pin that did not fill the entire space of the hole in the tread. (sorry for bad translation, I tried my best)