I am looking for a Latin word for "pseudonym". My (Finnish–Latin–Finnish) dictionary gives the translation pseudōnymum. However, this word seems to be absent in Lewis & Short, and no Latin word for "pseudonym" can be found. The Latin Wikipedia article about the word mentions sources from the 19th century.
This leads to a couple of questions:
- How old is the Latin word pseudonymum?
- What are the classical ways to say "pseudonym"?
My guess is that pseudonymum is too young to be classical, but I have no evidence. I have found some ancient instances of nomen falsum, but I wonder if this is the only expression or the preferred one.
Partial answers are welcome if you cannot provide a full answer to both questions.