دُجًا

(as written by some) or دُجًى (as written by others) Darkness; (S;) and so ↓ دُجْيَةٌ, of which, in this sense, [as well as in others, mentioned in article دجى,] دُجًى is also the plural, (S, and K in article دجى,) according to Ks, as mentioned by IJ, who holds it to be [only] singular; (Har p. 611;) and so, too, ↓ دَاجِيَةٌ, of which the plural is دَوَاجٍ: (TA:) or دُجًى signifies the blackness of night, with clouds, so that one sees not star nor moon: or, as some say, [the state of the night] when it covers everything; not from the being dark: [see 1, first sentence:] (TA:) and اللَّيْلُ ↓ دَيَاجِى signifies the darknesses, or intense darknesses, of night. (S, K.)

You say also لَيْلَةٌ دُجًى [A dark night, or a night that covers everything]: and لَيَالٍ دُجًى [dark nights, &c.]; not pluralizing the latter word, because it is a verbal noun used as an epithet. (TA.) [See also دَاجٍ.]