. . . "0"^^ . "114766890"^^ . . . "any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts"@en-us . "113924464"@en-us . "nitrogen oxide"@en-us . "14766890-n"^^ . . . . . "0"^^ . "nitrogen oxide"^^ . . .