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Definition of test tube noun from the Oxford Advanced Learner's Dictionary

test tube

noun

/ˈtest tjuːb/

/ˈtest tuːb/

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a small glass tube, closed at one end, that is used in scientific experimentsTopics Scientific researchc1
Oxford Collocations Dictionary
Test tube is used before these nouns:
baby
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See test tube in the Oxford Advanced American Dictionary

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adverb

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B2

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