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Use "rotula" in a sentence
"One rotula dating from 1122 is 28 feet long and 10 inches wide, covered with writing on both sides."
"Good sardine productivity is linked with the presence of the diatom Melosira (Paralia) sulcata, and poor productivity with Thalassiosira rotula “invasions”."
"Radulph says: "... figuram, cui sipos nomen est [symbol] in motum rotulae formatam nullius numeri significatione inscribi solere praediximus," and thereafter uses _rotula_."