سرد است

The word 'سرد' (sard) in Persian, meaning 'cold', has a long history, tracing its roots back to Old Persian and Proto-Indo-Iranian. It is cognate with words in various Indo-European languages, such as Sanskrit 'śiśira' (cold, winter) and Latin 'sordere' (to be dirty, perhaps with an association to a cold, dreary state). The 'است' (ast) is the present tense form of the verb 'to be' in Persian, stemming from Old Persian 'astiy' and Proto-Indo-Iranian '*Hasti'. Its usage in 'سرد است' is to form a descriptive statement, literally 'cold is', meaning 'it is cold'.