Noah Webster
Discoverable
DISCOVERABLE, adjective
1. That may be discovered; that may be brought to light, or exposed to view.
2. That may be seen; as, many minute animals are discoverable only by the help of the microscope.
3. That may be found out, or made known; as, the scriptures reveal many things not discoverable by the light of reason.
4. Apparent; visible; exposed to view.
Nothing discoverable in the lunar surface is ever covered.