adjective Also, discoidal.
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.

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

postdiscoidal, adjective
subdiscoid, adjective
subdiscoidal, adjective
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World English Dictionary
discoid (ˈdɪskɔɪd)
1.  like a disc
2.  (of a composite flower such as the tansy) consisting of disc florets only
3.  a disclike object

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

discoid dis·coid (dĭs'koid') or dis·coi·dal (dĭ-skoid'l)
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.
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Example sentences
The biopsy will not differentiate between systemic and discoid lupus, but it can rule out other diseases.
They then exposed the spheres to isopropanol, which collapsed them into the discoid shape characteristic of red blood cells.
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