interosseus

noun
in·​ter·​os·​se·​us | \ ˌin-tər-ˈäs-ē-əs How to pronounce interosseus (audio) \
plural interossei\ -​ē-​ˌī How to pronounce interossei (audio) \

Medical Definition of interosseus

: any of various small muscles arising from the metacarpals and metatarsals and inserted into the bases of the first phalanges:

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miscellaneous remnants or debris

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