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