lookdownn.adj.

Brit.

/ˈlʊkdaʊn/, U.S.

/ˈlʊkˌdaʊn/

Origin: Formed within English, by compounding. Etymons: look v., down adv.

Etymology: < look v. + down adv., after to look down at look v. Phrasal verbs 1. In sense A. 2, the fish is so called with reference to the position of its eyes.

A. n.

†1.

a. The view obtained by looking down. Obsolete.

ΘΚΠ

the world > physical sensation > sight and vision > thing seen > [noun] > view or scenery > from above

under-prospecta1586

despect1663

bird's eye view1755

lookdown1795

top view1895

airscape1921

1795 A. Radcliffe Journey 403 We..were soon amidst the flocks and the crags, whence the look down upon the lake and among the fells was solemn and surprising.

1816 Hist. & Descriptive Acct. Warwick 95 From this tower, the look down through the open space, left by the hanging battlements, is truly tremendous.

1857 National Mag. Apr. 353/2 With a ton and a half to lift from depths compared to which the look-down from St. Paul's Golden Cross to the Wellington crypt is only a fourth part, you may venture upon guessing that a stout rope is wanted.

1862 H. Marryat One Year in Sweden II. 401 The look-down on the works below..is awful.

b. A lookdown telescope or microscope (see sense B. 1). Obsolete. rare.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > other telescopes

polemoscope1668

finder1738

night-glass1758

collimator1825

floating collimator1833

lookdown1865

guiding telescope1897

autocollimator1903

kinetheodolite1941

finderscope1946

satellite telescope1951

scotoscope1964

starlight scope1964

1865 A. S. Waugh Pract. Instr. Trigonometrical Surv. Operations 13 The eye piece of the look-down must be adjusted to distinct vision of the wires.

1866 T. Maclear Verification La Caille's Arc of Meridian at Cape of Good Hope I. 248 The officer at the ‘look down’ of bar A levels his microscope, and brings the compensation dot into focus by means of the foot screws, and moves his end of the bar to bring the ‘look down’ (central microscope) over the dot on the point-carrier.

2. Originally U.S. A silvery carangid game fish, Selene vomer, found in the western Atlantic, having the eyes set high in a deep head. Also called moonfish, horsehead.

ΘΚΠ

the world > animals > fish > superorder Acanthopterygii (spiny fins) > order Perciformes (perches) > suborder Scombroidei (mackerel) > [noun] > family Carangidae (scads) > member of genus Selene or Vomer (moon-fish)

moonfish1646

hogback1832

sunfish1877

lookdown1882

horse-fish1883

horse-head1884

1882 D. S. Jordan & C. H. Gilbert Synopsis Fishes N. Amer. 439 (heading) S[elene] vomer (L.) Lütken.—Moon-fish; Look Down; Horse-head.

1908 Bull. Bureau Fisheries 28 1318 The effects of iridescence, especially with such fish as the mackerels, pompanos, and the lookdown.

1965 A. J. McClane Standard Fishing Encycl. 499/2 Both the lookdowns and the moonfish grow to about 10–12 inches.

2002 Sport Fishing June 49/1 Odd-shaped fish such as houndfish and eels or lookdowns.

B. adj. (attributive).

1. Of, relating to, or enabling the action of looking down; spec. designating an optical instrument in which the eyepiece is looked through in a downward direction. Now rare.

ΚΠ

1865 A. S. Waugh Pract. Instr. Trigonometrical Surv. Operations 13 When a look-down telescope is employed for centering,..the eye piece of the look-down must be adjusted to distinct vision of the wires.

1876 Minutes Proc. Inst. Civil Engineers 44 202 The observer..gets a side view of the bubble, which is never as satisfactory and sharply defined as the look-down view from above.

1911 Encycl. Brit. XXVI. 143/1 Six bars and five central and two end pairs of microscopes—the latter with their vertical axes perforated for a look-down telescope—constituted a complete apparatus.

2. Originally U.S. Designating an airborne or satellite radar system designed to distinguish the radar signal of an airborne body situated between it and the ground from those returned by the ground terrain; relating to or involving such radar.

ΘΚΠ

society > communication > telecommunication > radio communications > [adjective] > radar > types of

sideways-looking1832

primary radar1945

shoran1946

passive1954

monopulse1955

back scatter1957

monostatic1957

side-looking1959

side scan1961

lookdown1968

1968 Dept. Def. Appropriations Fiscal Year 1969 (U.S. Senate, Subcomm. of Comm. Appropriations, 90th Congr., 2nd Sess.) i. 492 The program objective is to provide the F-106..with the capability to detect a low-flying target by means of a clutter-free (look-down) radar.

1976 Economist 5 June 65 (advt.) The same look-down radar,..and weapons delivery system that make the F-15 an air superiority fighter, give it the accuracy demanded for attack missions.

1984 Interavia Nov. 1176/1 The latest version of Sea Sparrow..has a monopulse seeker and a digital computer, which gives it the lookdown tracking capability.

2007 D. K. Hitchins Syst. Engin. iii. xvi. 429 The problem was highlighted by the capability of the new radar. It was of a new type, with excellent lookdown capabilities.

This entry has been updated (OED Third Edition, March 2015; most recently modified version published online March 2022).

单词	lookdown
释义	lookdownn.adj. Brit. /ˈlʊkdaʊn/, U.S. /ˈlʊkˌdaʊn/ Origin: Formed within English, by compounding. Etymons: look v., down adv. Etymology: < look v. + down adv., after to look down at look v. Phrasal verbs 1. In sense A. 2, the fish is so called with reference to the position of its eyes. A. n. †1. a. The view obtained by looking down. Obsolete. ΘΚΠ the world > physical sensation > sight and vision > thing seen > [noun] > view or scenery > from above under-prospecta1586 despect1663 bird's eye view1755 lookdown1795 top view1895 airscape1921 1795 A. Radcliffe Journey 403 We..were soon amidst the flocks and the crags, whence the look down upon the lake and among the fells was solemn and surprising. 1816 Hist. & Descriptive Acct. Warwick 95 From this tower, the look down through the open space, left by the hanging battlements, is truly tremendous. 1857 National Mag. Apr. 353/2 With a ton and a half to lift from depths compared to which the look-down from St. Paul's Golden Cross to the Wellington crypt is only a fourth part, you may venture upon guessing that a stout rope is wanted. 1862 H. Marryat One Year in Sweden II. 401 The look-down on the works below..is awful. b. A lookdown telescope or microscope (see sense B. 1). Obsolete. rare. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > other telescopes polemoscope1668 finder1738 night-glass1758 collimator1825 floating collimator1833 lookdown1865 guiding telescope1897 autocollimator1903 kinetheodolite1941 finderscope1946 satellite telescope1951 scotoscope1964 starlight scope1964 1865 A. S. Waugh Pract. Instr. Trigonometrical Surv. Operations 13 The eye piece of the look-down must be adjusted to distinct vision of the wires. 1866 T. Maclear Verification La Caille's Arc of Meridian at Cape of Good Hope I. 248 The officer at the ‘look down’ of bar A levels his microscope, and brings the compensation dot into focus by means of the foot screws, and moves his end of the bar to bring the ‘look down’ (central microscope) over the dot on the point-carrier. 2. Originally U.S. A silvery carangid game fish, Selene vomer, found in the western Atlantic, having the eyes set high in a deep head. Also called moonfish, horsehead. ΘΚΠ the world > animals > fish > superorder Acanthopterygii (spiny fins) > order Perciformes (perches) > suborder Scombroidei (mackerel) > [noun] > family Carangidae (scads) > member of genus Selene or Vomer (moon-fish) moonfish1646 hogback1832 sunfish1877 lookdown1882 horse-fish1883 horse-head1884 1882 D. S. Jordan & C. H. Gilbert Synopsis Fishes N. Amer. 439 (heading) S[elene] vomer (L.) Lütken.—Moon-fish; Look Down; Horse-head. 1908 Bull. Bureau Fisheries 28 1318 The effects of iridescence, especially with such fish as the mackerels, pompanos, and the lookdown. 1965 A. J. McClane Standard Fishing Encycl. 499/2 Both the lookdowns and the moonfish grow to about 10–12 inches. 2002 Sport Fishing June 49/1 Odd-shaped fish such as houndfish and eels or lookdowns. B. adj. (attributive). 1. Of, relating to, or enabling the action of looking down; spec. designating an optical instrument in which the eyepiece is looked through in a downward direction. Now rare. ΚΠ 1865 A. S. Waugh Pract. Instr. Trigonometrical Surv. Operations 13 When a look-down telescope is employed for centering,..the eye piece of the look-down must be adjusted to distinct vision of the wires. 1876 Minutes Proc. Inst. Civil Engineers 44 202 The observer..gets a side view of the bubble, which is never as satisfactory and sharply defined as the look-down view from above. 1911 Encycl. Brit. XXVI. 143/1 Six bars and five central and two end pairs of microscopes—the latter with their vertical axes perforated for a look-down telescope—constituted a complete apparatus. 2. Originally U.S. Designating an airborne or satellite radar system designed to distinguish the radar signal of an airborne body situated between it and the ground from those returned by the ground terrain; relating to or involving such radar. ΘΚΠ society > communication > telecommunication > radio communications > [adjective] > radar > types of sideways-looking1832 primary radar1945 shoran1946 passive1954 monopulse1955 back scatter1957 monostatic1957 side-looking1959 side scan1961 lookdown1968 1968 Dept. Def. Appropriations Fiscal Year 1969 (U.S. Senate, Subcomm. of Comm. Appropriations, 90th Congr., 2nd Sess.) i. 492 The program objective is to provide the F-106..with the capability to detect a low-flying target by means of a clutter-free (look-down) radar. 1976 Economist 5 June 65 (advt.) The same look-down radar,..and weapons delivery system that make the F-15 an air superiority fighter, give it the accuracy demanded for attack missions. 1984 Interavia Nov. 1176/1 The latest version of Sea Sparrow..has a monopulse seeker and a digital computer, which gives it the lookdown tracking capability. 2007 D. K. Hitchins Syst. Engin. iii. xvi. 429 The problem was highlighted by the capability of the new radar. It was of a new type, with excellent lookdown capabilities. This entry has been updated (OED Third Edition, March 2015; most recently modified version published online March 2022). < n.adj.1795
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