1860 35 359 The rubber stoppers or packing..are removed from underneath the lower orifices of the moulds.
1922 T. M. Lowry ii. 17 The funnel is inserted into the neck of a strong conical flask, a rubber stopper being used to make a tight joint.
2002 Winter 52/3 Place a tiny rubber stopper like the ones that prevent pierced earrings from slipping off on the end of the hook.