نصاب niṣāb A (from نصب Heb. and Aram. ) s. f. 1. A root, origin, principle. 2. Dignity, fortune. 3. Capital, principal, property. 4. A certain estate or number of cattle for which a tax is paid. نصاب الصبيان niṣābu-ṣ-ṣibyān (lit. the capital stock of children) The title of an Arabic Vocabulary with Persian translation in rhyme.