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Neptune in Roman mythology, the god of the sea; Poseidon. [2 definitions]
neptunium a synthetic radioactive chemical element of the actinide series that contains ninety-three protons in each nucleus. (symbol: Np)
nerd (slang) a person regarded as dull, unattractive, inept, or the like.
Nereid (sometimes l.c.) in Greek mythology, a sea nymph. [2 definitions]
Nero a Roman emperor (37-68 A.D.).
nervation a system of veins, or veins collectively; venation.
nerve any of numerous bundles of fibers forming a system that carries stimuli and impulses to and from the brain and other parts of the body. [6 definitions]
nerve block a local anesthetic that works by temporarily deadening a particular nerve, usu. administered by injection into or next to the nerve.
nerve cell a neuron.
nerve center a group of closely connected nerve cells that performs a particular function. [2 definitions]
nerve gas any poisonous gas that attacks the nervous system.
nerve impulse an electrochemical signal that moves along a stimulated nerve fiber.
nerveless capable of maintaining one's composure in trying or dangerous situations. [2 definitions]
nerve-racking inflicting great strain or irritation on one's patience, courage, or the like.
nervous of or concerning the nerves. [4 definitions]
nervous breakdown a severe neurotic or psychotic crisis impairing an individual's ability to function normally.
nervous system the system of nerves and nerve centers in most multicellular animals.
nervure a vein, as in a leaf or insect wing, that forms a support for the structure in which it lies.
nervy (informal) rudely presumptuous; impertinent; brazen. [2 definitions]
nescience absence of knowledge; ignorance. [2 definitions]
-ness condition; quality; degree. [2 definitions]