a tube of thin, transparent glass closed at one end, used in chemical experiments, etc.
- made in or as in a test tube; experimental
- produced by artificial insemination: a test-tube baby
A clear, cylindrical glass tube usually open at one end and rounded at the other, used in laboratory experimentation.
- Produced or cultivated in a test tube.
- Produced, developed, or tested in a laboratory: test-tube corn.
(plural test tubes)