Modern French allows the "aine" suffix to be applied to many numbers, meaning "a group of X." I've mostly heard it used with 10 ("dixaine") or 12 ("douzaine"), though if you asked for a "treizaine" (13) of something, you would be understood.

It is interesting that "dozen" made it into everyday English but other group sizes did not.

> It's special because we don't have a word for, e.g., "13 of something", say, "trezen".

Hmm, how about 14 of something?

You have a fortnight to respond. Though if you take about a sennight longer to think about it, you'll still get a good score.

"baker's dozen"

That's two words.