单词 | quadrantal |
释义 | quadrantaladj.1 1. a. Mathematics and Surveying. Designating a triangle drawn on the surface of a sphere with one side a quarter-circle, esp. such a triangle with three right angles. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > triangular > other nonelike1551 quadrantal1616 subcontrary1669 orthic1920 1616 E. Wright tr. J. Napier Descr. Logarithms ii. iii. 42 A sphæricall triangle is either quadrantall [L. quadrantale] or not. 1651 C. Brookes Sphær. Triangles 4 Any right-angled or quadrantal triangle proposed. 1788 Philos. Trans. (Royal Soc.) 78 374 We may resolve the quadrantal triangle qcn. 1843 M. F. Maury Elem., Pract. & Theoret. Treatm. Navigation (ed. 2) 84 By some, problems that depend upon quadrantal triangles, are included in a separate division of spherical trigonometry, called ‘quadrantal trigonometry’. 1903 Amer. Math. Monthly 10 102 Quadrantal triangles..are of..frequent occurrence in the usual application of spherical trigonometry to elementary astronomy. 1974 Noûs 8 97 In keeping with the theorems of elliptical geometry, absolute units of visual distance are definable either in terms of (1) the length of sides of a triangle with three right angles (a quadrantal triangle), [etc.]. b. Having the shape of a quarter-circle; consisting of a quarter-circle. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > of or resembling part of circle quadrantal1674 quadrantile1721 segmental1815 segmentary1853 quadrantic1856 1674 R. Hooke Animadversions Machina Cœlestis 14 A very large Quadrantal Dividing Plate. 1703 R. Neve City & Countrey Purchaser 14 A Quadrantal Casement, rising from its Plain. 1798 Philos. Trans. (Royal Soc.) 88 529 The length of a quadrantal arch of the circle. 1867 A. Barry Life & Wks. Sir C. Barry iv. 116 The central building with quadrantal corridors. 1871 B. Stewart Heat (ed. 2) §71 A quadrantal arc of a meridian on the earth's surface. 1990 A. Chapman Dividing Circle ii. 22 Nonius' quadrant consisted of a flat plate of brass upon which were scribed 45 quadrantal arches, one inside the other. 2. a. Designating the error in ascertaining a direction on a ship or aircraft that arises from the magnetic effect of iron present in the vessel, the error varying with the vessel's orientation. ΚΠ 1857 W. Whewell Hist. Inductive Sci. (ed. 3) III. 528 The magnetic effect of the iron in a ship may be regarded as producing two kinds of deviation [of a ship's compass]..a ‘polar-magnet deviation’,..and a ‘quadrantal deviation’, which changes from positive to negative as the keel turns from quadrant to quadrant. 1925 H. C. Booth tr. F. Auerbach Mod. Magnetics (U.K. ed.) ix. 217 This effect, according to the nature and direction of the magnetic parts from which it proceeds, is either of a semi-circular or a quadrantal character; that is to say there are two or four positions of the ship for which it is zero, and two or four others for which it is a maximum or minimum. 1988 Jrnl. Navigation 41 335 The correction of quadrantal deviation, achieved by the proximity of the compasses to one another, was accurate only in the latitude in which the adjustment was made. b. Relating to the four points of the compass. ΚΠ 1957 K. R. Sealy Geogr. Air Transport v. 141 In practice, this 'quadrantal' pattern of international routes is somewhat modified by other factors. 1960 J. Clendinning Principles of Surveying (ed. 2) i. iv. 37 Magnetic compasses are often graduated on the quadrantal system, with the letters, N, E, S and W marked on the card or rim. 1990 P. Kearey & F. J. Vine Global Tectonics ii. 9 (caption) Quadrantal distribution of compressional and dilational P wave first motions about an earthquake. 3. Ophthalmology. = quadrantic adj. 2. Now rare. ΘΚΠ the world > physical sensation > sight and vision > [adjective] > parts of visual field quadrantic1885 quadrantal1914 1914 Trans. Ophthalmol. Soc. 34 209 Uncomplicated quadrantal unrecognised hemianopsia. 1918 Arch. Ophthalmol. 47 126 Early homonymous upper quadrantal defects in Stage I. 1942 Amer. Jrnl. Surg. 55 530/2 There was a left internal strabismus and a left inferior homonymous quadrantal defect. 2002 Ophthalmologica 216 168 Each quadrantal NFLT [= nerve fibre layer thickness] (nasal, temporal, superior, inferior) was compared. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). † quadrantaladj.2 Obsolete. rare. Apparently only attested in dictionaries or glossaries. Of the thickness of four fingers. ΚΠ 1656 T. Blount Glossographia Quadrantal..used Adjectively..four fingers thick, or three inches. 1658 E. Phillips New World Eng. Words Quadrantal, four fingers thick. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online June 2021). † quadrantaladj.3 Obsolete. rare. 1. Astronomy. = quartile adj. Cf. quadrant adj. 1b. ΘΚΠ the world > the universe > planet > position of planet > aspect > [adjective] > quadrature quadrantal1665 quartile1769 quadrated1810 1665 J. Gadbury London's Deliv. Predicted i. 4 The Conjunctional, Opposite, or Quadrantal Rays of Jupiter. 2. Square; having a square base. Cf. quadrant adj. 1a. ΘΚΠ the world > space > shape > angularity > specific angular shape > [adjective] > quadrilateral > square or rectangular > square quarryc1300 four-squarea1400 squarec1400 four-squared1513 quadrant1517 squadrant1599 quadran1605 quadratic1656 quadrantal1690 quadriform1856 1690 W. Leybourn Cursus mathematicus 317 Let ABCDE be a Quadrantal Pyramis, (for a Pyramis is denominated from the number of the equal Sides of the Base thereof, as here four). This entry has been updated (OED Third Edition, December 2007; most recently modified version published online June 2018). < adj.11616adj.21656adj.31665 |
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