| flash |
In photography, a flash is a device that produces an instantaneous flash of light (typically around 1/1000 of a second) to help illuminate a scene. While flashes can be used for a variety of reasons (e.g. capturing quickly moving subjects) they are mostly used to illuminate scenes that do not have enough available light to adequately expose the photograph. ...
출처: en.wikipedia.org/wiki/Flash_(photo)
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| flashlamp |
A xenon flash lamp is a gas discharge lamp designed to produce extremely intense, incoherent, full-spectrum white light for very short durations. The lamp is comprised of a sealed tube, often made of fused quartz, which is filled with a mixture of gases, primarily xenon, and electrodes to carry electrical current to the gas mixture. ...
출처: en.wikipedia.org/wiki/Flashlamp
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| flat |
In music, flat means "lower in pitch." More specifically, in music notation, flat means "lower in pitch by a semitone," and has an associated symbol (), which looks like a lowercase "b"; the note A flat is shown in musical notation in Figure 1. Under equal temperament, C flat is the same as, or enharmonically equivalent to, B and F flat is the same as E.There also exist double-flats, which look like and lower a note by two semitones. ...
출처: en.wikipedia.org/wiki/Flat
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| flax |
A flax was the name given to the improvised pole arm, derived from the agricultural tool used to gather flax. This consisted of a metal head mounted on a 7-8 foot long pole. The head had a serrated edge much like a saw along one side, topped by a broad flat hook. The reverse sported a simple spike. Much like a bill, this head was made of a single piece of tooled metal rather than many pieces later bolted together. ...
출처: en.wikipedia.org/wiki/Flax_(weapon)
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| flail |
A flail is an agricultural tool used for threshing, separating grains from their husks. Normally it is made from two or more sticks attached by a short chain or leather thong; one stick is held and swung, causing the other to strike a pile of grain, loosening the husks. The precise dimensions and shape of a flail would have been developed by generations of farmers to suit the particular grain they were harvesting. ...
출처: en.wikipedia.org/wiki/Flail
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