disk also disc (dĭsk)
1. A thin, flat, circular object or plate.
2. Something resembling such an object: The moon's disk was reflected in the pond.
a. The disk used in a disc brake.
b. A disk used on a disk harrow.
4. A round, flattened structure in a plant or animal, such as an intervertebral disk.
5. Botany The central area bearing numerous disk flowers in the flower head of a composite plant such as a daisy.
a. An optical disc, especially a compact disc.
b. A magnetic disk, such as a floppy disk or hard disk.
c. The data stored on such objects.
7. A phonograph record.
8. A circular grid in a phototypesetting machine.
tr.v. disked, disk·ing, disks also disced or disc·ing or discs
1. To work (soil) with a disk harrow.
2. To make (a recording) on a phonograph record.
[Latin discus, quoit, from Greek diskos, from dikein, to throw; see deik- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2017 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.
American Heritage Dictionary Products
The American Heritage Dictionary, 5th Edition
The American Heritage Dictionary of Idioms
The American Heritage Roget's Thesaurus
Curious George's Dictionary
The American Heritage Children's Dictionary
The American Heritage Dictionary of Indo-European Roots
The American Heritage Student Grammar Dictionary
The American Heritage Desk Dictionary + Thesaurus
The American Heritage Science Dictionary
The American Heritage Dictionary of Business Terms
The American Heritage Student Dictionary
The American Heritage Essential Student Thesaurus