>>And a sentence: Able was I, ere I saw Elba.
>
>The longest one I've ever heard is this:
go hang a salami, i'm a lasagna hog
which is a palindrome if you're willing to ignore the apostrophe.
I have seen several in the German language. The following is the longest I know about:
Ein Neger mit Gazelle zagt im Regen nie
Translation:
A negro with a gazella never tarries in the rain.
And an 8-letter single word:
Reittier
This means: an animal for riding (or meant to be ridden).
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)