Definition of "barnet"

Boris [Johnson], it seems, is taking it in this spirit, joshing beneath his ever-redeeming barnet that Labour's opposition to military action in Syria is a fey stance that he, as GQ politician of the year, would never be guilty of.

2013 September 13, Russell Brand, “Russell Brand and the GQ awards”, in The Guardian‎

Rather than banging on about my barnet, I’d ask friends about theirs.

2021 March 14, Michael Segalov, “It can leave your self-image fractured”, in The Guardian‎