interosseus

noun
in·​ter·​os·​se·​us | \ˌin-tər-ˈäs-ē-əs \
plural interossei\-​ē-​ˌī \

Medical Definition of interosseus 

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

a : dorsal interosseus

b : palmar interosseus

c : plantar interosseus

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