[WHDean]

Don't know of a specific term, but if you follow the conventions for forming such words, the correctly formed neologism would be "diology" or "dyology," since "duo" is Latin, not Greek.

 

[WHDean]

Well, Carradee found the word and the corresponding definition in Oxford, so the case is pretty much closed. I broke my own rule regarding assuming that someone must've actually looked it up; otherwise I'd have given the same answer.

 

[WHDean]

Do give Rebecca credit, please. As she said, she did look it up, in Merriam-Webster: the go-to dictionary for many U.S. publishers in the fiction world.

Not her fault she didn't know to check another dictionary before thinking it not a word.

I would give her credit, but I used up today's credit-giving quota on you. So, in a way, it's your fault that I can't give her credit.

[Procrastination has now reached dangerous levels]