Penumbra

Penumbra, the name given to the partial shadow on the rim of the total shadow of an eclipse, also to the margin of the light and shade of a picture.

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

Pentonville * Penzance
Pentagram
Pentamerone
Pentateuch
Pentecost
Pentelicus
Penthesilea
Pentheus
Penthièvre, Duc de
Pentland Firth
Pentonville
Penumbra
Penzance
People's Palace
Pepin the Short
Pepsin
Pepys, Samuel
Pera
Peræa
Perceval
Perceval, Spencer
Percival, James Gates