As an adjective internal
is inside of something.
As a noun mesofurca is
(entomology) the internal skeletal element of the mesosternum.
inside of something
within the body
- We saw the internal compartments
concerned with the domestic affairs of a nation, state or other political community.
- Her bleeding was internal
concerned with the non-public affairs of a company or other organisation
- The nation suffered from internal conflicts
- An internal investigation was conducted
* intern, interne
* internal link
(entomology) The internal skeletal element of the mesosternum.
*medifurca (obsolete )