any thin, flat, circular plate or object.
any surface that is flat and round, or seemingly so: the disk of the sun.
disc ( def 1 ).
Computers. any of several types of media consisting of thin, round plates of plastic or metal, used for external storage: magnetic disk; floppy disk; optical disk.
Botany, Zoology. any of various roundish, flat structures or parts.
Botany. (in the daisy and other composite plants) the central portion of the flower head, composed of tubular florets.
any of the circular steel blades that form the working part of a disk harrow.
Mathematics. the domain bounded by a circle.
Archaic. discus.
verb (used with object)
Informal. disc ( def 3 ).
to cultivate (soil) with a disk harrow.
Also, disc (for defs 1, 2, 4–9, 12).

1655–65; < Latin discus discus; cf. dish

disklike, adjective

disc, disk.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disc or esp (US) disk (dɪsk)
1.  a flat circular plate
2.  something resembling or appearing to resemble this: the sun's disc
3.  another word for (gramophone) record
4.  anatomy any approximately circular flat structure in the body, esp an intervertebral disc
5.  a.  the flat receptacle of composite flowers, such as the daisy
 b.  (as modifier): a disc floret
6.  the middle part of the lip of an orchid
7.  a.  Also called: parking disc a marker or device for display in a parked vehicle showing the time of arrival or the latest permitted time of departure or both
 b.  (as modifier): a disc zone; disc parking
8.  computing a variant spelling of disk
9.  to work (land) with a disc harrow
[C18: from Latin discus, from Greek diskos quoit]
disk or esp (US) disk
[C18: from Latin discus, from Greek diskos quoit]

disk (dɪsk)
1.  a variant spelling (esp US and Canadian) of disc
2.  computing Compare drum See also floppy disk magnetic disk, Also called: hard disk a direct-access storage device consisting of a stack of plates coated with a magnetic layer, the whole assembly rotating rapidly as a single unit. Each surface has a read-write head that can move radially to read or write data on concentric tracks

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

Amer.Eng. preferred spelling, 1660s, from L. discus "quoit, discus, disk," from Gk. diskos, from dikein "throw." Sense of "phonograph disk" is 1888; disk jockey first recorded 1941; dee-jay is from 1955; DJ is 1961; video version veejay is 1982. Computing sense is from 1947; Disk-drive is from 1952.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

disk or disc (dĭsk)

  1. A thin, flat, circular object or plate.

  2. See lamella.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
disk or disc   (dĭsk)  Pronunciation Key 
    1. See magnetic disk.

    2. See optical disk.

  1. See intervertebral disk.

  2. The round, flat center, consisting of many disk flowers, found in the inflorescences of many composite plants such as the daisy.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

disk definition

1. magnetic disk.
2. compact disc.
3. optical disk.
Note: the american spelling, "disk", is normal for most computer disks whereas "compact disc", having come to computers via the audio world, is correctly spelled with a "c", indeed, this spelling is part of the CD standard.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Split into quadrants, each section is engraved with the seal of the state,
  laying claim to its parcel of disk.
Each of its long shafts holds disks, and each disk has wheels with ten teeth
  that correspond to marks in the disks.
Move around the edge so that the ball of dough becomes a thin disk with a
  slightly thicker edge all around.
Both programs require a lot of processing speed and disk space.
Image for disk
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