long waven.

Brit.

/ˈlɒŋ weɪv/, U.S.

/ˈlɔŋ ˌweɪv/,

/ˈlɑŋ ˌweɪv/

Origin: Formed within English, by compounding. Etymons: long adj.¹, wave n.

Etymology: < long adj.¹ + wave n.

1. A wave, on a liquid or in a gas, that has a long wavelength; spec. a surface wave whose wavelength is large compared with the depth of the liquid.

ΘΚΠ

the world > matter > physics > mechanics > types of motion > [noun] > wave > types of wave

long wave1792

internal wave1804

stationary wave1833

solitary wave1838

standing wave1845

travelling wave1845

pressure wave1871

ripple1871

surface wave1887

sine wave1893

Rayleigh wave1903

shock wave1907

spherical wave1907

Love wave1924

bow shock1938

Rossby wave1951

soliton1965

1792 A. Swinton Trav. Norway, Denmark & Russia ix. 88 In the wide Atlantic and Pacific Oceans, the depth of the sea, and the extensive field it rolls upon, occasions a long wave, and of consequence a slow motion.

1839 Trans. Cambr. Philos. Soc. 7 95 Any particle P revolves continually in a circular orbit... The radius of this circle, and consequently the agitation of the fluid particles, decreases very rapidly as the depth c increases, and much more rapidly for short than long waves.

1895 H. Lamb Hydrodynamics viii. 276 Waves whose slope is gradual and whose length λ is large compared with the depth h of the fluid, are called ‘long waves’.

1914 Sci. Amer. Suppl. 24 Oct. 271/1 Navigation at high speed is..laborious in shoal water for the reason that the long waves produced are out of proportion to their possible depth.

1992 D. M. Souza Powerful Waves 21/1 The water in these long waves churns in somersaults deep in the ocean.

2004 D. Pugh Changing Sea Levels 245 Tides propagate as long waves.

a. An electromagnetic wave of long wavelength; (Telecommunications) a radio wave with a wavelength in a particular range of wavelengths, typically longer than one kilometre but less than ten kilometres (i.e. a frequency between 300 kHz and 30 kHz).

ΘΚΠ

society > communication > telecommunication > radio communications > [noun] > radio wave > length of > specific

short wave1839

medium wave1928

MW1938

long wave1965

1909 E. B. Titchener Text-bk. Psychol. i. 60 Let us take..a chart or projection of the solar spectrum, and let us work right through it, from the left or long-wave to the right or short-wave end.

1922 Amer. Industries Sept. 12/1 ‘Some years ago..’, said Marconi, ‘I could not help feeling that we had perhaps got rather in a rut by confining all our researches and our tests to what I may term long waves or waves of some thousands of feet in length.’

1929 Jrnl. Inst. Electr. Engineers 68 22/2 (table) The definitions were fixed as follows... Long waves. Below 100 [kilocycles/sec]... Medium waves. 1500 to 100... Intermediate waves. 6000 to 1500... Short waves 30000 to 6000... Very short waves. Above 30000.

1965 B.B.C. Handbk. 115 The signals which carry domestic broadcasting programmes are usually designed to be received by ground-wave on medium and long waves.

b. Also with capital initials. A waveband including long wavelengths.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [noun] > frequency > band of frequencies or wavelengths > of specific kind

long wave1913

stop band1922

broadband1956

narrowband1999

1913 Electrician & Mechanic Feb. 134/1 When you wish to get long wave, have a switch to connect the dead end of No. 1 to the slider of No. 2 and a switch to throw the antenna from No. 2 to the slider of No. 1.

1933 Pop. Mech. Jan. (front cover verso) (advt.) The Midwest super ‘16’ has four distinct wave bands…police, amateur, long wave, short wave.

1975 Gramophone Nov. 958/2 Decca's Compact 4 music centre now incorporates long wave in its tuner section.

1994 Which? Feb. 12/2 It seems Radio 4 will stay on both long wave (LW) and FM.

2006 Church Times 17 Nov. 15/2 The transfer of the Daily Service at 9.45 a.m. from AM/FM to Long Wave disenfranchised many of us, not least those who used to listen on car radios.

Compounds

General attributive (in sense 2a).

ΚΠ

1920 Boys' Life July 48/2 A long wave receiving set.

1928 D. Brunt Meteorol. v. 38 The term ‘low temperature radiation’ [is frequently used] to denote the long-wave radiation of bodies at relatively low temperature.

1928 Chambers's Jrnl. Jan. 79/1 Many foreign long-wave stations have also been clearly heard with this set.

1936 R. S. Glasgow Princ. Radio Engin. xiii. 401 The long-wave channel of the transatlantic radio telephone.

1974 New Eng. Jrnl. Med. 5 Dec. 1210/2 Oral methoxsalen and long wave ultraviolet light is a form of chemotherapy.

1987 P. Wright & P. Greengrass Spycatcher ii. 11 Before World War I Britain decided that a long-wave radio system should be built to replace the cable system as the principal means of communication with the Empire.

2001 Times 5 Dec. i. 17/6 To the right of my bed is a Long-Wave radio.

This entry has been updated (OED Third Edition, June 2016; most recently modified version published online March 2022).

单词	long wave
释义	long waven. Brit. /ˈlɒŋ weɪv/, U.S. /ˈlɔŋ ˌweɪv/, /ˈlɑŋ ˌweɪv/ Origin: Formed within English, by compounding. Etymons: long adj.¹, wave n. Etymology: < long adj.¹ + wave n. 1. A wave, on a liquid or in a gas, that has a long wavelength; spec. a surface wave whose wavelength is large compared with the depth of the liquid. ΘΚΠ the world > matter > physics > mechanics > types of motion > [noun] > wave > types of wave long wave1792 internal wave1804 stationary wave1833 solitary wave1838 standing wave1845 travelling wave1845 pressure wave1871 ripple1871 surface wave1887 sine wave1893 Rayleigh wave1903 shock wave1907 spherical wave1907 Love wave1924 bow shock1938 Rossby wave1951 soliton1965 1792 A. Swinton Trav. Norway, Denmark & Russia ix. 88 In the wide Atlantic and Pacific Oceans, the depth of the sea, and the extensive field it rolls upon, occasions a long wave, and of consequence a slow motion. 1839 Trans. Cambr. Philos. Soc. 7 95 Any particle P revolves continually in a circular orbit... The radius of this circle, and consequently the agitation of the fluid particles, decreases very rapidly as the depth c increases, and much more rapidly for short than long waves. 1895 H. Lamb Hydrodynamics viii. 276 Waves whose slope is gradual and whose length λ is large compared with the depth h of the fluid, are called ‘long waves’. 1914 Sci. Amer. Suppl. 24 Oct. 271/1 Navigation at high speed is..laborious in shoal water for the reason that the long waves produced are out of proportion to their possible depth. 1992 D. M. Souza Powerful Waves 21/1 The water in these long waves churns in somersaults deep in the ocean. 2004 D. Pugh Changing Sea Levels 245 Tides propagate as long waves. 2. a. An electromagnetic wave of long wavelength; (Telecommunications) a radio wave with a wavelength in a particular range of wavelengths, typically longer than one kilometre but less than ten kilometres (i.e. a frequency between 300 kHz and 30 kHz). ΘΚΠ society > communication > telecommunication > radio communications > [noun] > radio wave > length of > specific short wave1839 medium wave1928 MW1938 long wave1965 1909 E. B. Titchener Text-bk. Psychol. i. 60 Let us take..a chart or projection of the solar spectrum, and let us work right through it, from the left or long-wave to the right or short-wave end. 1922 Amer. Industries Sept. 12/1 ‘Some years ago..’, said Marconi, ‘I could not help feeling that we had perhaps got rather in a rut by confining all our researches and our tests to what I may term long waves or waves of some thousands of feet in length.’ 1929 Jrnl. Inst. Electr. Engineers 68 22/2 (table) The definitions were fixed as follows... Long waves. Below 100 [kilocycles/sec]... Medium waves. 1500 to 100... Intermediate waves. 6000 to 1500... Short waves 30000 to 6000... Very short waves. Above 30000. 1965 B.B.C. Handbk. 115 The signals which carry domestic broadcasting programmes are usually designed to be received by ground-wave on medium and long waves. b. Also with capital initials. A waveband including long wavelengths. ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > [noun] > frequency > band of frequencies or wavelengths > of specific kind long wave1913 stop band1922 broadband1956 narrowband1999 1913 Electrician & Mechanic Feb. 134/1 When you wish to get long wave, have a switch to connect the dead end of No. 1 to the slider of No. 2 and a switch to throw the antenna from No. 2 to the slider of No. 1. 1933 Pop. Mech. Jan. (front cover verso) (advt.) The Midwest super ‘16’ has four distinct wave bands…police, amateur, long wave, short wave. 1975 Gramophone Nov. 958/2 Decca's Compact 4 music centre now incorporates long wave in its tuner section. 1994 Which? Feb. 12/2 It seems Radio 4 will stay on both long wave (LW) and FM. 2006 Church Times 17 Nov. 15/2 The transfer of the Daily Service at 9.45 a.m. from AM/FM to Long Wave disenfranchised many of us, not least those who used to listen on car radios. Compounds General attributive (in sense 2a). ΚΠ 1920 Boys' Life July 48/2 A long wave receiving set. 1928 D. Brunt Meteorol. v. 38 The term ‘low temperature radiation’ [is frequently used] to denote the long-wave radiation of bodies at relatively low temperature. 1928 Chambers's Jrnl. Jan. 79/1 Many foreign long-wave stations have also been clearly heard with this set. 1936 R. S. Glasgow Princ. Radio Engin. xiii. 401 The long-wave channel of the transatlantic radio telephone. 1974 New Eng. Jrnl. Med. 5 Dec. 1210/2 Oral methoxsalen and long wave ultraviolet light is a form of chemotherapy. 1987 P. Wright & P. Greengrass Spycatcher ii. 11 Before World War I Britain decided that a long-wave radio system should be built to replace the cable system as the principal means of communication with the Empire. 2001 Times 5 Dec. i. 17/6 To the right of my bed is a Long-Wave radio. This entry has been updated (OED Third Edition, June 2016; most recently modified version published online March 2022). < n.1792
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