bead stop

inside stop, bead stop, inner bead, stop bead, window bead, window stop

In a double-hung window, a strip of wood fixed to the casing, along the inner edge of the inner sash; restricts the motion of the sash to a vertical plane.
References in periodicals archive ?
Most importantly, the manual meters contain a bead that goes up in the plastic tube when a patient blows into it; knowing exactly the point it at which the bead stops before dropping down into the tube is critical.