Cuill, a stealth search engine company we first covered in September, has raised $25M in a Series B round led by Madrone Capital Partners and joined by Tugboat Ventures and Greylock Partners.

Not a whole lot is known about Cuill except that it apparently can index the web at 1/10th the cost of Google. The startup was founded by search experts, two of which came from Google. It has been rumored that Google itself has looked at acquiring Cuill even before it launches.

We previously heard from sources that Cuill had raised $4M in a Series A round from Greylock Partners. That wasn’t exactly true – it had raised $8M from both Greylock and Tugboat. That raises Cuill’s total to at least $33M, with another $5M maybe from self-funding.