- noun a device that burns surplus gases to prevent them from being released into the environment, usually found on top of tall chimneys
- noun a firework that burns with a bright light and can be fired into the air to summon help
- Short, brilliant flash of light at the Sun’s surface in which huge amounts of charged particles are ejected into space. Flares are of intense practical interest because the particles which they eject cause brilliant aurorae but also interfere with radio communications.
- To open or spread outward. An example is the manner in which the cross section of a horn-shaped radiating device increases from one end of the tube to the other.
- On an oscilloscopic screen, such as that of a radar, an excessively bright area. Such an area is usually enlarged and distorted.
- A brief and intense light or flame.
- A bright eruption which develops near the surface of the sun. These are of tremendously high temperature, take a few minutes to reach full strength, and subside over the next hour or so. High-energy particles and rays are explosively released, and when they reach the earth may cause radio interference, magnetic storms, or auroras. Also called solar flare.
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