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[disk] /dɪsk/
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
Related forms
disklike, adjective
Can be confused
disc, disk. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for disks
  • Hard disks are sometimes compressed to create additional space.
British Dictionary definitions for disks


a variant spelling (esp US and Canadian) of disc
(computing) Also called magnetic disk, 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 Compare drum1 (sense 9) See also floppy disk
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for disks



American English preferred spelling, 1660s, "round flat surface," from Latin discus "quoit, discus, disk," from Greek diskos, from dikein "throw," from PIE *dik-skos-, from root *deik- "to show, pronounce solemnly; also in derivatives referring to the directing of words or objects" [Watkins].

Sense of "phonograph disk" is 1888; computing sense is from 1947. Disk jockey first recorded 1941; dee-jay is from 1955; DJ is 1961; video version veejay is 1982. Disk-drive is from 1952.

Online Etymology Dictionary, © 2010 Douglas Harper
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disks in Medicine

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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disks in Science
disk or disc
    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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disks in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010
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