[Going away; passing away; departing; transient; shifting; becoming remote, or absent; ceasing to be or exist; nonexistent: &c.: particle n. of زَالَ, q. v.].
2.
[Hence,] لَيْلٌ زَايءِلُ النُّجُومِ [properly A starless night, or night of which the stars are absent: but explained as meaning] (assumed tropical:) a long night. (Z, TA.)