Pyroxyline

Pyroxyline, an explosive substance obtained by steeping vegetable fibre in nitro-sulphuric acid and drying after it is washed.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Pyrenees * Pyrrha
Putney
Puy, Le
Puy-du-Dôme
Pygmalion
Pygmies
Pym, John
Pyramids
Pyramus and Thisbe
Pyrene
Pyrenees
Pyroxyline
Pyrrha
Pyrrhic Dance
Pyrrho
Pyrrhonism
Pyrrhus
Pyrrhus
Pythagoras
Pythagoreans
Pytheas
Pythian Games