Elil is a Lapine word for enemy. Animals who prey on rabbits are called elil, and those animals include dogs, cats, foxes, weasels, stoats, badgers, pikes, and birds of prey. Man is said to be most dangerous of all elil.
In the animated television series, the animal elil who speak broken Lapine notably call rabbits 'Long Ears'.
In the original book it is explained that "u hrair" means 'thousand' (or 'a lot', as rabbits cannot count beyond 4). it is a reference to the thousand enemies of rabbits.