PIW Full Form. Full Meaning of PIW Find long form and abbreviation, slang or definition of PIW. What does PIW mean? What does PIW stand for? We are providing world largest and most comprehensive acronyms, names, abbreviations database directory on the Internet. Our data base contains more than 8,00,000 terms abbreviations and acronyms. You can also search unique terms more than 4,00,000 general Comprehensive words.