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).

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). < adj.1926
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