The dual is pure Ibn Fares (395 AH) in his Dictionary of Language Standards

Abstract

What led us to study the glossary of language standards for the scholar Ibn Fars - may God have mercy on him -  is that it is a mature linguistic and literary manuscripts - as some researchers call it - glossary of language standards, and a qualitative additiona added to the lexical composition in the meanings of Arabic words.  The researcher chooses  a small part of its lexicon, which is (the duo originally called by Ibn Ibn Faris) believing that every word said by Ibn Faris - may Allah have mercy on him - has a purpose . The extrapolation of those words increases our deeper understanding  of the purposes of the author.