Definition of test-tube
(Entry 1 of 2)
1
: in vitro
test-tube experiments
2
: produced by in vitro fertilization
test-tube babies
test tube
nounDefinition of test tube (Entry 2 of 2)
: a plain or lipped tube usually of thin glass closed at one end and used especially in chemistry and biology
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The first known use of test-tube was in 1846
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