''Bahrayn'' is the dual form of Arabic ''bahr'' ("sea"), so ''al-Bahrayn'' originally means "the two seas". However, the name has been lexicalised as a feminine proper noun and does not follow the grammatical rules for duals; thus its form is always ''Bahrayn'' and never ''Bahrān'', the expected nominative form. Endings are added to the word with no changes, as in the name of the national anthem ''Bahraynunā'' ("our Bahrain") or the demonym ''Bahraynī''. The medieval grammarian al-Jawahari commented on this saying that the more formally correct term ''Bahrī'' (lit. "belonging to the sea") would have been misunderstood and so was unused.