from the GNU version of the Collaborative International Dictionary of English
- n. A solid related to a tetrahedron, and contained under twelve equal triangles.
from The Century Dictionary and Cyclopedia
- n. In crystallography, a solid related to a tetrahedron, and contained under twelve equal triangles. It is the hemihedral form of the tetragonal trisoctahedron or trapezohedron.
Sorry, no etymologies found.
Whether the more excited was zincoid or cuproid depended on the substance and its molecular condition.
_ -- Action current from more excited to less excited -- cuproid change in the excited -- e.g. fresh muscle and nerve, stale retina.
Stimulation of the uninjured end, approximating it to the condition of the injured, might then be said to induce a cuproid change.
The electric change produced in a normal nerve by stimulation may therefore be expressed by saying that there has been a negative variation, or that there was a current of action from the more excited to the less excited, or that stimulation has produced a cuproid change.
The uninjured end is therefore comparable to the zinc in a voltaic cell (is zincoid), the injured being copper-like or cuproid. [