τὸ δ' ἐξαίφνης τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν → suddenly refers to what has departed from its former condition in a time imperceptible because of its smallness
cŏlumbus: i, m. κόλυμβος; cf.: calvus, color,
I a male dove or cock - pigeon (and transf., of male persons), Varr. L. L. 9, § 56; Plaut. Rud. 3, 6, 49; Cat. 29, 9; 68, 125; Hor. Ep. 1, 10, 5,
I A dove in gen. (very rare), Col. 8, 8, 1; Plin. 10, 9, 11, § 25.