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We found 9 dictionaries with English definitions that include the word test tubes:
Click on the first link on a line below to go directly to a page where "test tubes" is defined.

General (7 matching dictionaries)

1. test tubes: Merriam-Webster.com [home, info]
2. test tubes: Collins English Dictionary [home, info]
3. test tubes: Vocabulary.com [home, info]
4. test-tubes: Wordnik [home, info]
5. test tubes: Cambridge Advanced Learner's Dictionary [home, info]
6. test tubes: Wiktionary [home, info]
7. Test tubes: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

8. Test tubes: Encyclopedia [home, info]

Medicine (1 matching dictionary)

9. Test tubes: Medical dictionary [home, info]

(Note: See test_tube for more definitions.)

Quick definitions from WordNet (test tube) ▸ noun:  glass tube closed at one end ▸ Also see test_tube ▸ Words similar to test tubes ▸ Usage examples for test tubes ▸ Words that often appear near test tubes ▸ Rhymes of test tubes ▸ Invented words related to test tubes