<p><strong>Noun</strong></p><ul><li>any thin, flat, circular plate or object.</li><li>any surface that is flat and round, or seemingly so: the disk of the sun.</li><li>(in Computers) any of several types of media consisting of thin, round plates of plastic or metal, used for external storage: magnetic disk; hard disk; optical disk.</li><li>any of various roundish, flat structures or parts.</li><li>(in Botany) the central portion of the flower head, composed of tubular florets.</li><li>any of the circular steel blades that form the working part of a disk harrow.</li><li>the domain bounded by a circle.</li><li>Archaic: discus.</li></ul><p><strong>Verb</strong></p><ul><li>to cultivate (soil) with a disk harrow.</li></ul>