word wheeling = search as you type
you know when you start typing something in a search box (such as in the latest version of Firefox) and the rest of the word or possible words and phrases are displayed? if you don't have Firefox, try it at Answers.com
that's called “word wheeling” — some computer brain is already searching possible choices even as you're typing in your search term
Say you intend to type "King Kong." Even before you type in the letter "o" in Kong, you already see "King Kong" offered as a choice that you can hit. Also below the top choice of "King Kong" you see "King Kamehameha" and other possible options you can scroll through.
from "word wheel" — what the lookup method is called