Google Analytics/Urchin - what does "other" mean?

[johnegood]

When I look at my stats, my top search term for July which represents 71% of my search terms, is "other" (sic).

What does "other" mean? It's got 71% of my traffic.

Here's why I'm confused.

I would have thought the stats program would only report search terms
that sent a certain minimum volume to my site. I would have guessed 10
visitors in a month. But as I look, all the details are there.
Specifically, starting at the 1430th most popular search terms, the search phrases only sent 2 visitors last month to my site! Starting at 2100, there were only 1 visitor per search phrase. This alone would make a huge "long tail" but then, my first term is the enigmatic "other" !?!

Would "other" mean untrackable?

My host company provides urchin 5.0.