Neurol´ogy, n. Study of the nerves.
Nic´titating Mem´brane, n. The third or inner eyelid of birds.
Nidifica´tion, n. Nest-building; mode of nesting.
Ni´dus, n. Nest.
Ni´sus Formati´vus, n. The formative tendency; the unknown law which determines the rudiment of an animal to take its proper shape, “each after its kind.” “Plastic force.”
Node, No´dus, n. A swelling; hence, a joint, as bones usually enlarge at their articulating extremities. Compare Internode.
Nomen´clature, n. The sum of the words or terms peculiar to any department of knowledge; as, ornithological nomenclature; in this sense equivalent to terminology. Also, the naming of objects according to some fixed principle; as, the binomial nomenclature. It is essential to the integrity of nomenclature that it should rest upon classification, or taxonomy.
Non-. Not. A frequent prefix in scientific literature, denoting negation, used much like dis-, un-, in-, etc.
Nos´tril, n. (28½.) See Naris.