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单词 ultra-short
释义

ultra-shortadj.

Brit. /ˌʌltrəˈʃɔːt/, U.S. /ˌəltrəˈʃɔrt/
Forms: Also ultrashort.
Etymology: ultra- prefix 3.
a. Radio. Applied to radio waves significantly shorter than the usual ‘short waves’: in modern use, shorter than 10 metres, corresponding to a frequency greater than 30 MHz (i.e. in the VHF range).
ΘΚΠ
society > communication > telecommunication > radio communications > [adjective] > type of wave
ultra-short1926
1926 E. V. Appleton in Proc. Cambr. Philos. Soc. 23 155 (heading) On the diurnal variation of ultra~short wave wireless transmission. [Note] The term ‘ultra~short’ is here applied to wave-lengths less than the critical band indicated by the magneto-ionic theory (i.e. about 200 meters). It seems desirable, for historical reasons, to retain the term ‘short waves’ for the broadcasting wave-lengths 200–600 metres.
1935 Discovery Sept. 278/1 A difficulty is..the limited range of these ultra-short wave~lengths, as we are dependent upon the direct waves propagated more or less parallel to the earth's surface.
1947 Nature 4 Jan. 16/1 The electrical interference from motor~car ignition systems..is a serious factor in the reception of ultra-short waves.
1974 Radio Engin. & Electronic Physics Dec. 20 (heading) Multiple diffractor amplification of ultrashort waves.
b. gen. Extremely short (in length or duration).
ΘΚΠ
the world > time > duration > shortness or brevity in time > [adjective]
shortc888
littleOE
shortlya1050
briefc1400
momentlya1425
small?a1439
momentany1447
momentaneous?a1450
stunta1450
momentaryc1485
momentane1510
hourlya1535
sudden1561
momentaneala1581
span-long1593
momentaneana1599
momental1606
narrow1611
timeless1657
concise1785
succinct1796
ultra-short1962
the world > space > extension in space > measurable spatial extent > longitudinal extent > shortness > [adjective] > rather, very, or too short
overshorta1400
shortish1800
ultra-short1962
1962 R. H. Smythe Anat. Dog Breeding 29 An ultra~short loin.
1975 Bio Syst. 7 45 Accordingly, we may introduce an ultrashort time scale.
1977 Jrnl. Royal Soc. Arts 125 766/1 The same lasers can be used to generate ultra-short light pulses.
This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2022).
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adj.1926
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更新时间:2024/12/25 1:27:37