- Any flat, thin piece of metal, clay, ivory, or the like, used for ornament, or for painting pictures upon, as a slab, plate, dish, or the like, hung upon a wall; also, a smaller decoration worn on the person, as a brooch.
- an accumulation of bacteria on teeth
- (medicine) an accumulation of fat, usually cholesterol, in blood vessels
- (biology) a clearing in a bacteria, bacterial lawn caused by a virus
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