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We found 15 dictionaries with English definitions that include the word tertiary period:
Click on the first link on a line below to go directly to a page where "tertiary period" is defined.

General (11 matching dictionaries)

1. Tertiary period: Collins English Dictionary [home, info]
2. Tertiary period: Vocabulary.com [home, info]
3. tertiary period: Wordnik [home, info]
4. tertiary period: Dictionary.com [home, info]
5. Tertiary Period, Tertiary period: Wikipedia, the Free Encyclopedia [home, info]
6. Tertiary period: Rhymezone [home, info]
7. tertiary period: Free Dictionary [home, info]
8. tertiary period: Mnemonic Dictionary [home, info]
9. tertiary period: WordNet 1.7 Vocabulary Helper [home, info]
10. Tertiary period: LookWAYup Translating Dictionary/Thesaurus [home, info]
11. Tertiary period: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

12. Tertiary Period, Tertiary Period: Encyclopedia [home, info]

Medicine (1 matching dictionary)

13. Tertiary Period, Tertiary period: Medical dictionary [home, info]

Science (2 matching dictionaries)

14. Tertiary Period: Dictionary of Geology [home, info]
15. Tertiary Period: Atmospheric Chemistry and Air Quality [home, info]

Quick definitions from WordNet (Tertiary period) ▸ noun:  from 63 million to 2 million years ago ▸ Words similar to tertiary period ▸ Words that often appear near tertiary period ▸ Rhymes of tertiary period ▸ Invented words related to tertiary period