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.
Origin of discoid
1785–95;Related formspost·dis·coi·dal, adjectivesub·dis·coid, adjectivesub·dis·coi·dal, adjective
< Late Latin discoīdēs
< Greek diskoeidḗs
quoit-shaped. See discus
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for discoidspherical
Examples from the Web for discoid
Historical Examples of discoid
The tumors appear as discoid prominences of varying size and number.
The radiate type is shown by discoid infusoria, by medusæ, by starfish and their allies.
Anterior above with a small, linear-oval, black, discoid spot.
Heads discoid, 15–many-flowered, in corymbose cymes; flowers perfect.
The tubular flowers compose the disk; and a head which has no ray-flowers is said to be 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
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
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.