We found 25 dictionaries that define the word test tube:

General (19 matching dictionaries)

1. test tube: Longman Dictionary of Contemporary English
2. test-tube, test tube: Merriam-Webster
3. test tube: Oxford Learner's Dictionaries
4. test-tube, test tube: American Heritage Dictionary of the English Language
5. test tube: Collins English Dictionary
6. test tube: Vocabulary.com
7. Test-Tube, Test-tube, test-tube, test tube: Wordnik
8. test tube: Cambridge Advanced Learner's Dictionary
9. test tube: Wiktionary
10. test-tube, test tube: The Wordsmyth English Dictionary-Thesaurus
11. test tube: Infoplease Dictionary
12. test-tube, test tube: Dictionary.com
13. Test-tube, Test tube: Wikipedia, the Free Encyclopedia
14. test tube: Rhymezone
15. test tube: FreeDictionary.org
16. test tube: Mnemonic Dictionary
17. test-tube, test tube: TheFreeDictionary.com

Computing (1 matching dictionary)

18. test-tube, test tube: Encyclopedia

Medicine (4 matching dictionaries)

19. test tube: Merriam-Webster Medical Dictionary
20. Dorland's Illustrated Medical Dictionary (No longer online)
21. online medical dictionary (No longer online)
22. test-tube, test tube: Medical dictionary

Slang (1 matching dictionary)

23. Test tube: Urban Dictionary

(Note: See test_tubes as well.)

Definitions from Wiktionary (test tube) ▸ noun:  (chemistry) A glass tube, rounded at one end and open at the other, used for small-scale laboratory tests. Similar: tube, thistle tube, flask, thief tube, finger, vacutainer, policeman, buret, tubelet, peanut tube, more... Opposite: beaker, flask, graduated cylinder Phrases: test tube baby, test tube babies, test tube conception, Peter and the Test Tube Babies, Test tube rack, more... Adjectives: autoclave, centrifugal, reverberatory, reverbatory, heating, oil-fired, open-hearth, calefactory, open hearth, gas-fired ▸ Words similar to test tube ▸ Usage examples for test tube ▸ Idioms related to test tube ▸ Wikipedia articles (New!) ▸ Words that often appear near test tube ▸ Rhymes of test tube ▸ Invented words related to test tube