<p><strong>Noun</strong></p><ul><li>a very fine thread or threadlike structure; a fiber or fibril</li><li>a single fibril of natural or synthetic textile fiber, of indefinite length, sometimes several miles long</li><li>a long slender cell or series of attached cells, as in some algae and fungi</li><li>the stalklike portion of a stamen, supporting the anther</li><li>the barb of a down feather</li><li>the threadlike conductor, often of tungsten, in a light bulb or other incandescent lamp that is heated to incandescence by the passage of current</li><li>the heating element (sometimes also acting as a cathode) of a vacuum tube, resembling the filament in an incandescent bulb</li><li>a solar prominence, as viewed within the sun's limb</li></ul><p><strong>Verb</strong></p><ul><li>to collect (something) as toll</li><li>to impose a tax or toll on (a person)</li></ul>