from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A thin, flat, circular object or plate.
  • n. Something resembling such an object: The moon's disk was reflected in the pond.
  • n. The disk used in a disc brake.
  • n. A disk used on a disk harrow.
  • n. A round, flattened, platelike structure in an animal, such as an intervertebral disk.
  • n. Botany The enlarged area bearing numerous tiny flowers, as in the flower head of composite plants, such as the daisy. Also called discus.
  • n. Computer Science A magnetic disk, such as a floppy disk or hard disk.
  • n. Computer Science The data stored on such a disk: read the disk that came with the manual.
  • n. An optical disk, especially a compact disk. See Usage Note at compact disk.
  • n. A phonograph record.
  • n. A circular grid in a phototypesetting machine.
  • transitive v. To work (soil) with a disk harrow.
  • transitive v. To make (a recording) on a phonograph record.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A thin, flat, circular plate or similar object.
  • n. Something resembling a disk.
  • n. A vinyl phonograph/gramophone record.
  • n. A floppy disk - removable magnetic medium or a hard disk - fixed, persistent digital storage.
  • n. A disc - either a CD-ROM, an audio CD, a DVD or similar removable storage medium.
  • n. A harrow.
  • n. A ring- or cup-shaped enlargement of the flower receptacle or ovary that bears nectar or, less commonly, the stamens.
  • v. to harrow

from the GNU version of the Collaborative International Dictionary of English

  • n. A discus; a quoit.
  • n. A flat, circular plate.
  • n. The circular figure of a celestial body, as seen projected of the heavens.
  • n. A circular structure either in plants or animals
  • n.
  • n. The whole surface of a leaf.
  • n. The central part of a radiate compound flower, as in sunflower.
  • n. A part of the receptacle enlarged or expanded under, or around, or even on top of, the pistil.
  • n.
  • n. The anterior surface or oral area of cœlenterate animals, as of sea anemones.
  • n. The lower side of the body of some invertebrates, especially when used for locomotion, when it is often called a creeping disk.
  • n. In owls, the space around the eyes.

from The Century Dictionary and Cyclopedia

  • In agriculture, to cultivate with a disk-cultivator.
  • n. Same as discus, 1.
  • n. In the Gr. Ch., a paten.
  • n. 3. Any flat, or approximately or apparently flat, circular plate or surface.
  • n. Specifically In botany: The flat surface of an organ, such as a leaf, in distinction from the margin.
  • n. Any flat, circular, discus-shaped growth, as the adhesive disks which form on the tendrils of the Virginia creeper.
  • n. In the tubuliflorous Compositæ, the series of flowers having a tubular corolla, and forming the central portion or whole of the head, as distinct from a surrounding ligulate-flowered ray; also, the central portion of any radiate inflorescence
  • n. An enlargement of the torus of a flower about the pistil.
  • n. A name sometimes given to the bordered pits (otherwise called dots and discoid markings) which characterize the woody tissue of gymriosperms, as the pine.
  • n. The hymenium of a discocarp; the cup-like or otherwise expanded surface on which the asci are borne in Discomycetes.
  • n. In zoöl, and anatomy, any flattened and rounded surface or part; a discus.
  • n. In armor, same as roundel.
  • n. One of the collars separating and securing the cutters on a horizontal mandrel.
  • n.
  • n. A small medicated gelatin tablet about of an inch thick, which contains a small amount of glycerin to prevent it from becoming hard and brittle: a simple means of applying accurately adjusted quantities of mydriatic, myotic, and anesthetic alkaloids such as atropin, physostigmine, and cocaïne to the eye.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. draw a harrow over (land)
  • n. (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
  • n. a flat circular plate
  • n. something with a round shape resembling a flat circular plate
  • n. sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove


from The American Heritage® Dictionary of the English Language, 4th Edition

Latin discus, quoit, from Greek diskos, from dikein, to throw; see deik- in Indo-European roots.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek δίσκος (diskos, "a circular plate suited for hurling"), from δικείν (dikein, "to hurl, to launch").



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  • in cycling, a disk is a rotor in disk brakes - in the cycling use, disks barely resemble a 'disk' due to the cutouts to reduce weight, improve air cooling, and promote mud shedding.

    January 12, 2013

  • disk = underlying technology is magnetic

    disc = underlying technology is optical

    August 29, 2010