We found 11 dictionaries that define the word extinctions:

General (7 matching dictionaries)

1. extinctions: Merriam-Webster
2. extinctions: Collins English Dictionary
3. extinctions: Vocabulary.com
4. Extinctions, extinctions: Wordnik
5. extinctions: Wiktionary
6. Extinctions: Wikipedia, the Free Encyclopedia
7. Extinctions: TheFreeDictionary.com

Business (1 matching dictionary)

8. Extinctions: Legal dictionary

Computing (1 matching dictionary)

9. Extinctions: Encyclopedia

Medicine (2 matching dictionaries)

10. extinctions: Merriam-Webster Medical Dictionary
11. Extinctions: Medical dictionary

(Note: See extinction as well.)

Definitions from Wikipedia (Extinctions) ▸ noun:  a Miles Franklin Award-winning novel by Australian writer Josephine Wilson. Phrases: mass extinctions, Timeline of extinctions in the Holocene, more... ▸ Words similar to extinctions ▸ Usage examples for extinctions ▸ Idioms related to extinctions ▸ Wikipedia articles (New!) ▸ Popular adjectives describing extinctions ▸ Words that often appear near extinctions ▸ Rhymes of extinctions ▸ Invented words related to extinctions