Medical Dictionary
3 ENTRIES FOUND:

opponens

noun op·po·nens \ə-ˈpō-ˌnenz\
plural op·po·nen·tes \ˌäp-ə-ˈnen-(ˌ)tēz\ or op·po·nens

Definition of OPPONENS

:  any of several muscles of the hand or foot that tend to draw one of the lateral digits across the palm or sole toward the others
March 31, 2015
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