We found 12 dictionaries that define the word nitrogen oxides:

General (4 matching dictionaries)

1. nitrogen oxides: Merriam-Webster
2. nitrogen oxides: Vocabulary.com
3. nitrogen oxides: Wiktionary
4. Nitrogen oxides: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

5. nitrogen oxides: Encyclopedia

Medicine (2 matching dictionaries)

6. Medical Dictionary (No longer online)
7. online medical dictionary (No longer online)

Science (1 matching dictionary)

8. Atmospheric Chemistry and Air Quality (No longer online)

Tech (4 matching dictionaries)

9. Nitrogen Oxides: Glossary of Air Pollution Terms
10. AUTOMOTIVE TERMS (No longer online)
11. Glossary of Meteorology (No longer online)
12. Glossary of Energy Terms (No longer online)

(Note: See nitrogen_oxide as well.)

Definitions from Wiktionary (nitrogen oxide) ▸ noun:  (chemistry) Any oxide of nitrogen. ▸ Also see nitrogen_oxide ▸ Words similar to nitrogen oxides ▸ Usage examples for nitrogen oxides ▸ Idioms related to nitrogen oxides ▸ Wikipedia articles (New!) ▸ Words that often appear near nitrogen oxides ▸ Rhymes of nitrogen oxides ▸ Invented words related to nitrogen oxides