Nitrogen

Nitrogen, a gaseous element which constitutes one-fourth in volume of the atmosphere, is the basis of nitric acid, and is an essential constituent of proteids, alkaloids, and albuminoids.

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

Nithsdale, William Maxwell, Earl of * Nitzsch, Karl Ludwig
Nimeguen
Nîmes
Nimrod
Nineveh
Ninian St.
Ninus
Niobe
Nirvâna
Nisus
Nithsdale, William Maxwell, Earl of
Nitrogen
Nitzsch, Karl Ludwig
Nixie
Nizam
Nizam's Dominions, The
Noah
Noailles
Noakes, John O'
Noble
Nocturne
Nodes