01 n. A discus; a quoit.
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1.
A discus; a quoit.“Some whirl the disk, and some the javelin dart.” — Pope.
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2.
A flat, circular plate; as, a disk of metal or paper.
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3.
The circular figure of a celestial body, as seen projected of the heavens.(Astron.)
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4.
A circular structure either in plants or animals; as, a blood disk; germinal disk, etc.(Biol.)
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5.
The whole surface of a leaf.(Bot.)
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6.
The anterior surface or oral area of cœlenterate animals, as of sea anemones.(Zool.)
Phrases & compounds
Disk engine —
a form of rotary steam engine.
Disk shell —
any species of Discina.