|1.||(of an electrical switch, button, etc) having an `on' position and an `off' position|
|2.||existing at times and not at others; discontinuous: an on-off relationship|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
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