We found 7 dictionaries that define the word parts per billion:

General (1 matching dictionary)

1. Parts Per Billion (film), Parts Per Billion, Parts per Billion, Parts per billion: Wikipedia, the Free Encyclopedia

Business (1 matching dictionary)

2. BusinessDictionary.com (No longer online)

Science (1 matching dictionary)

3. Parts per Billion: Extragalactic Astronomy

Tech (4 matching dictionaries)

4. Lake and Water Word Glossary (No longer online)
5. Schlumberger Oilfield Glossary (No longer online)
6. Water-Science Glossary of Terms (No longer online)

Definitions from Wikipedia (Parts per Billion) ▸ noun:  a 2013 American romantic drama written and directed by Brian Horiuchi. ▸ Words similar to parts per billion ▸ Usage examples for parts per billion ▸ Idioms related to parts per billion ▸ Wikipedia articles (New!) ▸ Words that often appear near parts per billion ▸ Rhymes of parts per billion ▸ Invented words related to parts per billion