etymology citation

The problem is that the citation does not contain the term "triangular hebesphenorotunda" at all. Citations are supposed to show the term as it is used.

Ok, but it explains the etymological roots of the term in detail, attributed to the guy who coined the term. I'm not sure where else to put that information, maybe I should just integrate it into the etymology section?

Or maybe that level of detail isn't necessary, and I should just forget about it?

It's probably not necessary. Our etymologies mostly focus on how the word came to exist, and leave out anything else.