discoid

[ dis-koid ]

adjective

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

noun

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

discoid

/ ˈdɪskɔɪd /

adjective

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

noun

1. a disclike object

Other Words From

• postdis·coidal adjective
• sub·discoid adjective
• subdis·coidal adjective

Word History and Origins

Origin of discoid¹

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

Example Sentences

The radiate type is shown by discoid infusoria, by medusæ, by starfish and their allies.

From Project Gutenberg

Heads discoid, 15–many-flowered, in corymbose cymes; flowers perfect.

From Project Gutenberg

The tubular flowers compose the disk; and a head which has no ray-flowers is said to be discoid.

From Project Gutenberg

Heads discoid, 2–5-flowered, several together clustered into a compound pedunculate head; flowers perfect.

From Project Gutenberg

Heads rather many-flowered, discoid; flowers as in Pluchea, the central usually sterile.

From Project Gutenberg

Related Words

• disc
• plate
• platter