arthrocentesis

noun
ar·thro·cen·te·sis | \ˌär-(ˌ)thrō-sen-ˈtē-səs \
plural arthrocenteses\-ˌsēz \

Medical Definition of arthrocentesis 

: surgical puncture of a joint especially for aspiration of fluid from the joint Arthrocentesis of the right elbow joint was performed in the emergency department; the aspirate was orange-tinted, with 17,250 white cells per cubic millimeter …— Benjamin T. Davis and Mark S. Pasternack, The New England Journal of Medicine, 21 June 2007 I asked him to do an arthrocentesis—put a needle in the ankle and get a sample of the suspicious fluid causing the swelling.— Rahul Parikh, The Los Angeles Times, 30 Mar. 2009

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