mesaxonic
/ˌmɛzakˈsɒnɪk/ /ˌmɛsakˈsɒnɪk/ /ˌmiːsakˈsɒnɪk/Zoology
adjective
Of the foot of an ungulate or (in later use) the hand of a primate: having the axis of symmetry running through the central digit.
Origin
Late 19th century. From meso- + axon + -ic; compare earlier homaxonic and monaxonic.