If this word does exist somewhere and I simply haven't seen it, please correct me.
... and so MG has done in the comments. He cites two examples where the word is used by מהרש"א:
:מועד קטן ט"ז
So this is still a curious matter. Let's say the word is not used through the ראשונים and suddenly appears. Where did it come from? Indeed, לשון הקדש is an evolving language as seen throughout תנ"ך and history. We find new words arise that haven't been used before. But what makes this more puzzling is that there already exists a perfectly sufficient word in the language. Why create a new one?