Definition of test tube in English:

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test tube

Pronunciation: /ˈtes(t) ˌt(y)o͞ob/


1A thin glass tube closed at one end, used to hold small amounts of material for laboratory testing or experiments.
Example sentences
  • The lipid was deposited as a film on the wall of a glass test tube by solvent evaporation under nitrogen.
  • Just because conception takes place in a laboratory test tube, it is no less emotionally fraught for the couple concerned and no less morally taxing for the rest of us.
  • The girl, 14 at the time of the incident in May 1996, was injured when a test tube of ethanol boiled over during a chemistry class.
1.1 [as modifier] Denoting things produced or processes performed in a laboratory: new forms of test-tube life
More example sentences
  • In the January Chemical Research in Toxicology, Fukuhara's group describes test-tube experiments showing that even at high concentrations, the synthetic catechin remains an antioxidant.
  • After four or five days in space, the sperm will be returned to Earth where it will used to make test-tube piglets.
  • Adorability notwithstanding, the test-tube koalas are by-products of a project to establish the use of long-shelf-life koala sperm as a means of shoring up vulnerable populations.
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