spinal tap

noun

🔊/ˈspaɪnl tæp/

[countable] (North American English)

(also lumbar puncture [countable, uncountable] British and North American English)

(medical医学)

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a medical procedure in which liquid is removed from the lower part of the spine with a hollow needle, usually in order to diagnose a medical problem (= identify what it is)腰椎穿刺（放液）