We found 13 dictionaries that define the word conservation of matter:

General (9 matching dictionaries)

1. conservation of matter: Merriam-Webster
2. conservation of matter: Vocabulary.com
3. conservation of matter: The Wordsmyth English Dictionary-Thesaurus
4. conservation of matter: Dictionary.com
5. Conservation of matter: Wikipedia, the Free Encyclopedia
6. conservation of matter: Rhymezone
7. conservation of matter: FreeDictionary.org
8. conservation of matter: Mnemonic Dictionary
9. conservation of matter: TheFreeDictionary.com

Computing (1 matching dictionary)

10. conservation of matter: Encyclopedia

Medicine (2 matching dictionaries)

11. conservation of matter: Merriam-Webster Medical Dictionary
12. conservation of matter: Medical dictionary

Science (1 matching dictionary)

13. Conservation of Matter: Extragalactic Astronomy

Definitions from WordNet (conservation of matter) ▸ noun:  a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system Phrases: law of conservation of matter, more... ▸ Words similar to conservation of matter ▸ Usage examples for conservation of matter ▸ Idioms related to conservation of matter ▸ Wikipedia articles (New!) ▸ Words that often appear near conservation of matter ▸ Rhymes of conservation of matter ▸ Invented words related to conservation of matter