Nebelung Cat: A longhaired cat bred to resemble the Russian Blue cat except with a long coat.

Necklace: A term referring to the bandings of color across the lower neck and chest area which give the appearance of a necklace.

Neuter: Castration of a male cat.

Nictitating Membrane: A transparent inner eyelid in birds, reptiles, and some mammals that closes to protect and moisten the eye. Also called third eyelid.

Nocturnal: Of, relating to, or occurring in the night. See also Crepuscular

Norwegian Forest Cat: A breed of domestic cat native to Northern Europe and characterized by a thick, fluffy double-layered coat, and a long bushy tail.