<p><strong>Noun</strong></p><ul><li>the point, gist, or heart of something.</li><li>a knob or protuberance.</li><li>a lump or small piece: a nub of coal; a nub of pencil.</li><li>a small mass of fibers produced on a card, dyed brilliant colors, and introduced into yarn during the spinning process.</li></ul><p><strong>End of Response</strong></p>