We found 13 dictionaries that define the word tertiary period:

General (9 matching dictionaries)

1. Tertiary period: Collins English Dictionary
2. Tertiary period: Vocabulary.com
3. tertiary period: Wordnik
4. tertiary period: Dictionary.com
5. Tertiary Period: Wikipedia, the Free Encyclopedia
6. Tertiary period: Rhymezone
7. tertiary period: FreeDictionary.org
8. tertiary period: Mnemonic Dictionary
9. Tertiary period: TheFreeDictionary.com

Computing (1 matching dictionary)

10. Tertiary Period, Tertiary Period: Encyclopedia

Medicine (1 matching dictionary)

11. Tertiary Period, Tertiary period: Medical dictionary

Science (2 matching dictionaries)

12. Tertiary Period: Dictionary of Geology
13. Atmospheric Chemistry and Air Quality (No longer online)

(Note: See tertiary_periods as well.)

Definitions from WordNet (Tertiary period) ▸ noun:  from 63 million to 2 million years ago Phrases: a tertiary period epoch, more... ▸ Words similar to tertiary period ▸ Usage examples for tertiary period ▸ Idioms related to tertiary period ▸ Wikipedia articles (New!) ▸ Words that often appear near tertiary period ▸ Rhymes of tertiary period ▸ Invented words related to tertiary period