Lewis & Short

sūdus, a, um, adj. [se-udus; cf.: sudum siccum quasi seudum id est sine udo, Fest. pp. 294 and 295 Müll.], without moisture, dry; and of the weather, cloudless, bright, clear (class.; cf. serenus).

  1. I. Adj.: ventorum flamina suda, Lucil. ap. Non. 31, 19: flamen venti, Varr. ib. 234, 7: ver, Verg. G. 4, 77: tempestas, App. de Deo Socr. p. 42, 27: splendor luminis, id. M. 11, p. 260, 30: cuncta specula vel uda vel suda videre, id. Mag. p. 283, 37.
    Adverb.: sudum, brightly, Prud. Cath. 7, 79.
    1. B. Subst.: sūdum, i, n., bright, clear weather: cum sudum est, Plaut. Mil. 1, 1, 2: horologium mittam et libros, si erit sudum, Cic. Fam. 16, 18, 3: dum sudum est, Plaut. Rud. 1, 2, 35: arma Per sudum rutilare vident, Verg. A. 8, 529; Val. Fl. 2, 115.
  2. II. Somewhat moist = subudus; ardentia viscera adhuc suda de sanguine, Arn. 7, 3.