Nirukta ("explanation, etymological interpretation") is one of the six Vedānga disciplines of Hinduism, treating etymology, particularly of obscure words, especially those occurring in the Vedas. The discipline is traditionally attributed to Yāska, an ancient Sanskrit grammarian. Yāska's association with the discipline is so great that he is also referred to as Niruktakāra or Niruktakrit ("Maker of Nirukta"), as well as Niruktavat ("Author of Nirukta"). In practical use, nirukta consists of brief rules (sūtras) for deriving word meanings, supplemented with glossaries of difficult or rare Vedic words.