hydrarthrosis

noun
hy·​drar·​thro·​sis | \ ˌhi-(ˌ)drär-ˈthrō-səs How to pronounce hydrarthrosis (audio) \
plural hydrarthroses\ -​ˌsēz How to pronounce hydrarthroses (audio) \

Medical Definition of hydrarthrosis

: a watery effusion into a joint cavity