Usually means: Glass container for laboratory experiments.
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We found 11 dictionaries that define the word test-tube:

General (8 matching dictionaries)
  1. test-tube: Merriam-Webster
  2. test-tube: American Heritage Dictionary of the English Language
  3. Test-Tube, Test-tube, test-tube: Wordnik
  4. test-tube: The Wordsmyth English Dictionary-Thesaurus
  5. test-tube: Dictionary.com
  6. Test-tube: Wikipedia, the Free Encyclopedia
  7. test-tube: TheFreeDictionary.com
  8. test-tube: Wiktionary

Computing (1 matching dictionary)
  1. test-tube: Encyclopedia

Medicine (2 matching dictionaries)
  1. test-tube: Merriam-Webster Medical Dictionary
  2. test-tube: Medical dictionary

Definitions from Wiktionary (Test-tube)

noun:  Alternative form of test tube [(chemistry) A glass tube, rounded at one end and open at the other, used for small-scale laboratory tests.]

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