py·ro·phos·phor·ic acid 
(pī′rō-fŏs-fôrĭk)
(pī′rō-fŏs-fôrĭk)n.
A glacial or syrupy viscous liquid, H4P2O7, used as a catalyst and in organic chemical manufacture.
- whitefly
- white-footed mouse
- white fox
- White Friar
- white-fronted goose
- white frost
- white gasoline
- white-glove
- white gold
- white goods
- Whitehall
- Whitehall
- whitehead
- Whitehead
- white-headed
- white heat
- White Hmong
- white hole
- white hope
- Whitehorse
- white-hot
- White House
- white iron pyrites
- white knight
- white-knuckle