spondylolisthesis

noun
spon·​dy·​lo·​lis·​the·​sis | \ˌspän-də-lō-lis-ˈthē-səs \

Medical Definition of spondylolisthesis 

: forward displacement of a lumbar vertebra on the one below it and especially of the fifth lumbar vertebra on the sacrum producing pain by compression of nerve roots

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