contiuncula

contĭuncŭla, ae, f. dim. [contio], a short harangue, a trifling speech (only in the foll. passages):

oratorem excludi ab omni doctrina, ac tantum in judicia et contiunculas tamquam in aliquod pistrinum detrudi,

Cic. de Or. 1, 11, 46; id. Att. 2, 16, 1.