rill Copy link Outline 1. rīvŭlus (not used in poet. before Prud.2. amnĭcŭlus (dimin. of amnis) • rill: 1. rīvŭlus (not used in poet. before Prud.: the earlier authors seem to have used rīvus instead, of which this is a dimin.: see Catul. 68, 58: only fig. in Cic.): a tiny r., tenuis r., Cic. Rep. 2, 19. 2. amnĭcŭlus (dimin. of amnis): Liv. 36, 22.