adjective Also dis·coi·dal.

having the form of a discus or disk; flat and circular.
Botany. (of a composite flower) consisting of a disk only, without rays.


something in the form of a disk.
Dentistry. an excavator with a disklike blade.

Nearby words

  1. discogenic,
  2. discogram,
  3. discographer,
  4. discographical,
  5. discography,
  6. discoid lupus erythematosus,
  7. discology,
  8. discolor,
  9. discoloration,
  10. discolour

Origin of discoid

1785–95; < Late Latin discoīdēs < Greek diskoeidḗs quoit-shaped. See discus, -oid

Related formspost·dis·coi·dal, adjectivesub·dis·coid, adjectivesub·dis·coi·dal, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for discoid

British Dictionary definitions for discoid


adjective Also: discoidal (dɪsˈkɔɪdəl)

like a disc
(of a composite flower such as the tansy) consisting of disc florets only


a disclike object
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

Medicine definitions for discoid




Shaped like or resembling a disk.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.