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plural doorknobs
A circular device attached to a door, the rotation of which permits the unlatching of the door. quotations examples
A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place.
2012 March, Henry Petroski, “Opening Doors”, in American Scientist, volume 100, number 2, pages 112–3
(informal, derogatory) A stupid person. examples