نَسَّابٌ
Root: نسب
Full Definition
نَسَّابٌ
and
نَسَّابَةٌ Skilful in genealogy: [or rather, the former signifies very skilful in genealogies; or a great genealogist:] the latter, possessing the utmost knowledge in genealogies; or a most skilful genealogist: [this being of a doubly intensive form;] the ة being annexed to render the epithet one of excessive praise: pl. of the former نَسَّابُونَ, and of the latter نَسَّابَاتٌ: you say عِنْدِى ثَلَاثَةُ
نسّاباتٍ, meaning ثلاثة رِجَالٍ نسّاباتٍ.