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mul·tif·i·dus | \ ˌməl-ˈtif-ə-dəs 
\
\ plural multifidi\ -ˌdī \
\Medical Definition of multifidus
: a muscle of the fifth and deepest layer of the back filling up the groove on each side of the spinous processes of the vertebrae from the sacrum to the skull and consisting of many fasciculi that pass upward and inward to the spinous processes and help to erect and rotate the spine
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