We found 12 dictionaries that define the word quaternary period:

General (7 matching dictionaries)

1. Quaternary period: Vocabulary.com
2. quaternary period: Dictionary.com
3. Quaternary Period, Quaternary period: Wikipedia, the Free Encyclopedia
4. Quaternary period: Rhymezone
5. quaternary period: FreeDictionary.org
6. quaternary period: Mnemonic Dictionary
7. Quaternary period: TheFreeDictionary.com

Computing (1 matching dictionary)

8. Quaternary Period: Encyclopedia

Medicine (1 matching dictionary)

9. Quaternary period: Medical dictionary

Science (1 matching dictionary)

10. On-Line Biology Book: GLOSSARY (No longer online)

Tech (2 matching dictionaries)

11. Glossary of Meteorology (No longer online)
12. Lake and Water Word Glossary (No longer online)

(Note: See quaternary_periods as well.)

Definitions from WordNet (Quaternary period) ▸ noun:  last 2 million years Opposite: Tertiary period, Cenozoic era ▸ Words similar to quaternary period ▸ Usage examples for quaternary period ▸ Idioms related to quaternary period ▸ Wikipedia articles (New!) ▸ Words that often appear near quaternary period ▸ Rhymes of quaternary period ▸ Invented words related to quaternary period