عَصِيبٌ
Root: عصب
Full Definition
def.2 Also, and عَصَبْصَبٌ A vehement, or severe, day: or a vehemently-hot day: and the former is in like manner applied to a night (لَيْلَة), without ة: and ↓ the latter signifies also a cold, and very cloudy, day, in which nothing is seen of the sky.
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