hertz
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tɑfBased on the Random House Dictionary, © Random House, Inc. 2013.
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| a fool or simpleton; ninny. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
hertz (hɜːts) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n , pl hertz | |
| Hz the derived SI unit of frequency; the frequency of a periodic phenomenon that has a periodic time of 1 second; 1 cycle per second | |
| [C20: named after Heinrich Rudolph | |
| Hertz (hɜːts, German hɛrts) | |
| —n | |
| 1. | Gustav (ˈɡʊstaf). 1887--1975, German atomic physicist. He provided evidence for the quantum theory by his research with Franck on the effects produced by bombarding atoms with electrons: they shared the Nobel prize for physics (1925) |
| 2. | Heinrich Rudolph (ˈhainrɪç ˈruːdɔlf). 1857--94, German physicist. He was the first to produce electromagnetic waves artificially |
| 'Hertzian | |
| —adj | |
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Hertz
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hertz (hûrts)
n. pl. hertz
Abbr. Hz
A unit of frequency equal to 1 cycle per second.
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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hertz (hûrts) Pronunciation Key
(click for larger image in new window) The SI derived unit used to measure the frequency of vibrations and waves, such as sound waves and electromagnetic waves. One hertz is equal to one cycle per second. The hertz is named after German physicist Heinrich Hertz (1857-1894). |
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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The international unit of frequency: one cycle per second. The abbreviation for hertz is Hz.
Note: Household current in the United States is sixty hertz.
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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hertz
unit of frequency. The number of hertz (abbreviated Hz) equals the number of cycles per second. The frequency of any phenomenon with regular periodic variations can be expressed in hertz, but the term is used most frequently in connection with alternating electric currents, electromagnetic waves (light, radar, etc.), and sound. It is part of the International System of Units (SI), which is based on the metric system. The term hertz was proposed in the early 1920s by German scientists to honour the 19th-century German physicist Heinrich Hertz. The unit was adopted in October 1933 by a committee of the International Electrotechnical Commission and is in widespread use today, although it has not entirely replaced the expression "cycles per second."
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