<p><strong>Noun</strong></p><ul><li>A person who finds or makes a path, way, route, etc., especially through a previously unexplored or untraveled wilderness.</li><li>An airplane, or a person dropped from a plane, sent into a target area to illuminate the area for succeeding aircraft.</li><li>A radar beacon beamed into a target area to provide guidance for missiles seeking the target.</li><li>(Initial capital letter) An unmanned spacecraft that landed on Mars on July 4, 1997, to obtain climatic and geologic data.</li></ul>