mesocuneiform

from The Century Dictionary.

• noun In anatomy and zoology, the middle one of the three cuneiform bones of the tarsus, lying between the ectocuneiform and the entocuneiform. It is in special relation with the head of the second metatarsal bone. Also called mesosplenoid.
• Middle, as a cuneiform bone; pertaining to the mesocuneiform.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Anat.) One of the bones of the tarsus. See 2d cuneiform.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun anatomy One of the bones of the tarsus.