disc

Etymology

From French disque, from Latin discus, from Ancient Greek δίσκος (dískos, “disk, quoit, platter”). Doublet of dais, desk, discus, dish, disk, and diskos.

noun

1. A thin, flat, circular plate or similar object.
   A coin is a disc of metal.
2. (anatomy) An intervertebral disc.
3. Something resembling a disc.
   [A] peculiar luminous and sinuous marking appeared on the unillumined half of the inner planet, and almost simultaneously a faint dark mark of a similar sinuous character was detected upon a photograph of the Martian disc. 1898, H.G. Wells, The War of the Worlds, London: William Heinemann, page 300
   Venus's disc cut off light from the Sun.
4. A vinyl phonograph / gramophone record.
   Turn the disc over, after it has finished.
5. (botany) The flat surface of an organ, as a leaf, any flat, round growth.
6. (disc sports) Ellipsis of flying disc.; Synonym of frisbee; generic name for the trademark Frisbee;

verb

1. (agriculture) To harrow with a disc harrow.
   It is held that discing is as much value to lucerne as cultivation is to corn. October 11, 1901, “Discing Lucerne”, in The Agricultural Journal and Mining Record, volume 4, number 16, page 488
2. (aviation, of a propeller) To move towards, or operate at, zero blade pitch, orienting the propeller blades face-on to the oncoming airflow and maximising the drag generated by the propeller.
   In the air, the asymmetric drag generated by a discing propeller can result in loss of control of the airplane.