Lane's Arabic-English Lexicon

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قَاسَ

Root: قوس

Form: 1

Full Definition

قَاسَI , and عَلَى غَيْرِهِ, Present.T يَقُوسُهُ, Verbal.Noun قَوْسٌ and قِيَاسٌ, i. q. قَاسَهُ, Present.T يَقِيسُهُ, Verbal.Noun قَيْسٌ and قِيَاسٌ; i. e., He measured the thing by another thing like it; [both in the proper sense and mentally; but the latter verb is the more common, though the former, accord. to the JK, is the original;] and so الشَّىْءَ بِغَيْرِهِ: but you should not say for قُسْتُهُ or قِسْتُهُ.

def.2 قَوِسَ: see 5.
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