What is the chinese meaning of "nitrogen oxide"?

The chinese meaning of "nitrogen oxide" is 氮氧化物。
氮氧化物指的是只由氮、氧兩種元素組成的化合物。常見的氮氧化物有一氧化氮（NO，無色）、二氧化氮（NO2，紅棕色）、笑氣（N2O）、五氧化二氮（N2O5）等，其中除五氧化二氮常態下呈固體外，其他氮氧化物常態下都呈氣態。
The term nitrogen oxide is a general term and can be used to refer to any of these oxides (oxygen compounds) of nitrogen, or to a mixture of them:

Nitric oxide (NO), nitrogen(II) oxide
Nitrogen dioxide (NO2)
Dinitrogen monoxide (N2O), nitrous oxide
Dinitrogen trioxide (N2O3)
Dinitrogen tetroxide (N2O4)
Dinitrogen pentoxide (N2O5)
A mixture is often formed in chemical reactions that produce nitrogen oxides, with the proportions depending on the specific reaction and the conditions it is performed in. This is one reason why home production of N2O is undesirable; the other two stable oxides - which are extremely toxic - are liable to be produced.
參考資料:
http://en.wikipedia.org/wiki/Nitrogen_oxide
http://zh.wikipedia.org/wiki/%E6%B0%AE%E6%B0%A7%E5%8C%96%E7%89%A9

1亞硝酰氯 2氯氧化氮