Etymology
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disc (n.)

Latinate spelling preferred in British English for most uses of disk (q.v.). American English tends to use it in the musical recording sense (1888); originally of phonograph records, recently of compact discs.

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papilledema (n.)

also papilloedema, non-inflammatory swelling of the optic disc, 1908, from papilla + edema.

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CD-ROM 

1983, in computer jargon; also cd-rom; from compact disc read-only memory.

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discography (n.)

"catalogue of recordings by a composer or performer," 1933; see disc + -graphy.

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DVD 

1995, initialism (acronym) from Digital Video Disc, later changed to Digital Versatile Disc.

Earlier this year, electronics giant Toshiba positioned the first DVD players available in the U.S. as a home entertainment unit (retail price $600). [Black Enterprise magazine, June 1997]
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discophile (n.)

 "enthusiast for or collector of gramophone recordings," 1940, from disc in the musical recording sense + -phile "one that loves or is attracted to." The earlier word was gramophile.

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mandala (n.)

symbolic magic circle used by Buddhists in meditation, 1792, from Sanskrit mandala "disc, circle." Adopted 20c. in Jungian psychology as a symbol of unity of the self and completeness.

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floppy (adj.)

1858, "inclined to flop" [OED], from flop + -y (2). Floppy disc attested from 1971 (short form floppy is by 1974).

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slipknot (n.)

also slip-knot, 1650s, from slip (v.) + knot (n.). One which easily can be "slipped" or undone by pulling on the loose end of the last loop.

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CD 

1979 as an abbreviation of compact disc as a digital system of information storage. By 1959 as an abbreviation of certificate of deposit "written statement from a bank acknowledging it has received a sum of money from the person named" (1819).

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