ظلم

ظُلَمٌ ذ an appellation of Three nights (T, S, K) of the lunar month (T, S) next after the three called دُرَعٌ; (T, S, * K; *) so says A'Obeyd: (T:) thus called because of their darkness: (S:) the sing. is ↓ ظَلْمَاآءُ; (T, S;) so that it is anomalous; for by rule it should be ظُلْمٌ; (S;) and the sing. of دُرَعٌ is دَرْعَاآءُ: so says A'Obeyd: but accord. to AHeyth and Mbr, the sings. are ↓ ظُلْمَةٌ and دُرْعَةٌ, agreeably with rule; and this is the correct assertion. (T. [See more in art. درع, voce أَدْرَعُ.])