2. auctumnus (correctly aut-), a, um, adj. [1. auctumnus], autumnal (poet. or in post-Aug. prose): imber, Cato, R. R. 58: autumno frigore, Ov. M. 3, 729 (Merk., autumni frigore): sidera, Manil. 2, 269: tempus, id. 2, 425: pruinae, Aus. Idyll. 8, 10; Cod. Th. 2, 8, 2: aequinoctium, Plin. 19, 6, 33, § 108: tempestas, Gell. 19, 7, 2.