numbers racket
— Noun
– English
～ an illegal daily lottery
nerve-racking
— Adjective
– English
～ extremely irritating to the nerves; "nerve-racking noise"; "the stressful days before a war"; "a trying day at the office"
naval radar
— Noun
– English
～ naval equipment consisting of a shipboard radar
nervus radialis
— Noun
– English
～ largest branch of the brachial plexus; extends down the humerus to the lateral epicondyle where it divides into one branch that goes to the skin on the back of the hand and another that goes to the underlying extensor muscles
neutron radiation
— Noun
– English
～ radiation of neutrons (as by a neutron bomb)
nonparticulate radiation
— Noun
– English
～ radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge