elementdiameter
The term "elementdiameter" is not a standard or recognized term in scientific, engineering, or any other established field. It is possible that this term is a typo, a neologism, or specific to a very niche context.
If "elementdiameter" is intended to refer to the diameter of a constituent element, then the meaning would
In engineering or materials science, "element" could refer to a component within a larger structure or system.