intermedium
/ˌɪntəˈmiːdɪəm
/noun (plural intermedia /ˌɪntəˈmiːdɪə/) Zoology
(In tetrapods) a carpal in the centre of the wrist joint, or a tarsal in the centre of the ankle joint.It is thickest at its presumed proximal end and is expanded medially to form an overlapping joint with the intermedium....
- They therefore identified the medial, proximal tarsal bone of Diadectes as the intermedium and equated it with the reptilian astragalus.
- The intermedium articulated only proximally and distally - that is, it did not articulate with other wrist bones.
Origin
Late 16th century (denoting an intervening action or performance): from late Latin, neuter (used as a noun) of Latin intermedius 'intermediate'.