Disk

Disk

(dsk), n. [L. discus, Gr. di`skos. See Dish.]
[Written also disc.]
1. A discus; a quoit.
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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. (Astron.) The circular figure of a celestial body, as seen projected of the heavens.
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4. (Biol.) A circular structure either in plants or animals; as, a blood disk; germinal disk, etc.
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5. (Bot.) (a) The whole surface of a leaf. (b) The central part of a radiate compound flower, as in sunflower. (c) A part of the receptacle enlarged or expanded under, or around, or even on top of, the pistil.
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6. (Zol.) (a) The anterior surface or oral area of clenterate animals, as of sea anemones. (b) The lower side of the body of some invertebrates, especially when used for locomotion, when it is often called a creeping disk. (c) In owls, the space around the eyes.
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Disk engine, a form of rotary steam engine. -- Disk shell (Zol.), any species of Discina.
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Thu 13th December 2018