Webster
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Webster’s Revised Unabridged Dictionary · 1913

Disk

Disk (dĭsk), n. [L. discus, Gr. δίσκος. See Dish.] [Written also disc.] 1. A discus; a quoit.

Some whirl the disk, and some the javelin dart. Pope.

2. A flat, circular plate; as, a disk of metal or paper.

3. (Astron.) The circular figure of a celestial body, as seen projected of the heavens.

4. (Biol.) A circular structure either in plants or animals; as, a blood disk; germinal disk, etc.

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.

6. (Zoöl.) (a) The anterior surface or oral area of cœlenterate 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.

Disk engine, a form of rotary steam engine. — Disk shell (Zoöl.), any species of Discina.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.