paracentesis

noun
para·​cen·​te·​sis | \ˌpar-ə-(ˌ)sen-ˈtē-səs \
plural paracenteses\-​ˌsēz \

Medical Definition of paracentesis 

: a surgical puncture of a bodily cavity (as of the abdomen) with a trocar, aspirator, or other instrument usually to draw off an abnormal effusion for diagnostic or therapeutic purposes

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