وَهُوَ مِنَ الثُّلَاثِيِّ قِيَاسٌ
Translation: Its formation from a triliteral root follows an analogy.
Triliteral means a three-consonant root; productive means the pattern can be formed by a grammatical rule, subject to usage and convention.
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A Productive Triliteral Pattern
Asmāʾ al-Afʿāl — Definition, Uses and Parsing
وَهُوَ مِنَ الثُّلَاثِيِّ قِيَاسٌ
Translation: Its formation from a triliteral root follows an analogy.
Triliteral means a three-consonant root; productive means the pattern can be formed by a grammatical rule, subject to usage and convention.