Meaning & use
test tube
A thin cylindrical glass container, closed at one end, used to hold small samples in a laboratory.
See it in a sentence
The chemistry student carefully poured the blue liquid into a clean test tube.
Each test tube on the rack contained a slightly different concentration of the solution.
A note on using this word
Often used figuratively in 'test-tube baby,' referring to a child conceived through in vitro fertilization.
Words with a similar meaning
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