Pineal Gland

Pineal Gland, a small cone-shaped body of yellowish matter in the brain, the size of a pea, and situated in the front of the cerebellum, notable as considered by Descartes to be the seat of the soul, but is now surmised to be a rudimentary remnant of some organ, of vision it would seem, now extinct.

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

Pindus, Mount * Pinel, Philippe
Pilgrim Fathers
Pillar-Saints
Pillars of Hercules
Pillory
Piloty, Karl von
Pilsen
Pindar
Pindar, Peter
Pindarees
Pindus, Mount
Pineal Gland
Pinel, Philippe
Pinero, Arthur Wing
Pinerolo
Pinkerton, John
Pinkie
Pinto, Mendez
Pinturicchio
Pinzen
Piozzi, Hester
Pipe of Peace