any circular or rotating mechanism

a sheet of metal or wood or glass or plastic

a disk coated with cellulose acetate

a disk or plate that is fixed to the wheel; pressure is applied to it by the brake pads

(nautical) a round hardwood disk with holes and a grooved perimeter used to tighten a shroud

electro-acoustic transducer that vibrates to receive or produce sound waves

a disk used in throwing competitions