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We found 13 dictionaries with English definitions that include the word astronauts:
Click on the first link on a line below to go directly to a page where "astronauts" is defined.

General (10 matching dictionaries)

1. astronauts: Merriam-Webster.com [home, info]
2. astronauts: Collins English Dictionary [home, info]
3. astronauts: Vocabulary.com [home, info]
4. Astronaut's, Astronauts, astronaut's, astronauts: Wordnik [home, info]
5. astronauts: Cambridge Advanced Learner's Dictionary [home, info]
6. astronauts: Wiktionary [home, info]
7. astronauts: Dictionary.com [home, info]
8. astronauts: Cambridge Dictionary of American English [home, info]
9. Astronauts (TV series), Astronauts (band), Astronauts, The Astronauts (TV series), The Astronauts (US band), The Astronauts (band), The Astronauts (company), The Astronauts (film), The Astronauts: Wikipedia, the Free Encyclopedia [home, info]
10. Astronauts: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

11. Astronauts: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

12. Astronauts: Medical Dictionary [home, info]
13. astronauts: online medical dictionary [home, info]

(Note: See astronaut for more definitions.)

Quick definitions from WordNet (astronaut) ▸ noun:  a person trained to travel in a spacecraft ("The Russians called their astronauts cosmonauts") ▸ Also see astronaut ▸ Words similar to astronauts ▸ Usage examples for astronauts ▸ Popular adjectives describing astronauts ▸ Words that often appear near astronauts ▸ Rhymes of astronauts ▸ Invented words related to astronauts