Prismatic colours

Prismatic colours, the seven colours a ray of pure white light is resolved into when refracted through a prism, applied figuratively by Carlyle to the pure light refracted through the soul of a man of genius.

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

Priscillian * Prisoner of Chillon
Primrose League
Prince Edward Island
Prince of Peace
Princeton
Pringle, Thomas
Printed Paper
Prinzenraub
Prior, Matthew
Priscian
Priscillian
Prismatic colours
Prisoner of Chillon
Privateer
Privy Council
Privy Seal
Probus, Marcus Aurelius
Proclus
Proconsul
Procop
Procopius
Procrustes