"elf" is the German equivalent of "eleven".
Well, there's "eleven" the number (11), or you could be meaning "elven" as in "to do with elves."
counterfeit
An eleven sided polygon is called a hendecagon, or an undecagon. The name is Greek, hendeka meaning eleven and gon meaning corner.
Convenience.
temperature
Stylishness.
"Aon-deug" meaning "One-ten"
Rapscallion is a word meaning urchin.
The Latin word for XI is undecim meaning eleven.
The 11th in a set or sequence. Or amounting to eleven in numbers.
It could either be the Latin form of undec- or the Greek form of hendeca-.