She takes over the Daily Mail site for women from John Lawrence, who himself succeeded former editor Maria Trkulja, when she moved to edit Hello! last year.
Teale's former colleague Tracey Williams is now in sole charge of iVillage, which has 1.5 million unique users, comfortably ahead of femail.co.uk's 292,000, according to ABCe figures. Williams has worked at the site for a year.
Teale reports to Avril Williams, editorial director of femail.co.uk's owner, Associated New Media. It is thought that health issues will continue to be a major topic for femail.co.uk, which was formerly known as charlottestreet.co.uk.
It relaunched at the end of 2000, just as iVillage itself launched. The latter was then a joint venture between Tesco and US website iVillage.com, but last month the supermarket chain bought it outright.
The women's lifestyle market remains a competitive one online, with handbag.com attracting 651,200 unique users.