We found 15 dictionaries that define the word parts per million:

General (3 matching dictionaries)

1. parts per million: Collins English Dictionary
2. Parts-per-million, Parts per million: Wikipedia, the Free Encyclopedia
3. Parts per million: TheFreeDictionary.com

Business (2 matching dictionaries)

4. Construction Term Glossary (No longer online)
5. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)

6. I T Glossary (No longer online)
7. Parts per million: Encyclopedia

Medicine (1 matching dictionary)

8. parts per million: Medical dictionary

Science (2 matching dictionaries)

9. Parts per Million: Extragalactic Astronomy
10. Parts per million (ppm): NRC Glossary of Nuclear Terms --

Tech (5 matching dictionaries)

11. AUTOMOTIVE TERMS (No longer online)
12. parts per million (ppm): Canadian Soil Information System
13. Lake and Water Word Glossary (No longer online)
14. Schlumberger Oilfield Glossary (No longer online)
15. Water-Science Glossary of Terms (No longer online)

Phrases: parts per million (ppm), more... ▸ Words similar to parts per million ▸ Usage examples for parts per million ▸ Idioms related to parts per million ▸ Wikipedia articles (New!) ▸ Words that often appear near parts per million ▸ Rhymes of parts per million ▸ Invented words related to parts per million