sinicaladj.
/ˈsɪnɪkəl/ Mathematics. † b. sinical quadrant n. a former nautical instrument having intersecting sines drawn from each side.
a. Of or relating to a sine or sines; employing or founded upon sines.
ΘΚΠ
the world > relative properties > number > geometry > [adjective] > branches of > of trigonometry
sinical1593
trigonometrical1666
trigonometric1811
trig1862
1593 T. Fale Horologiographia f. 60 This Table of Sines may seeme obscure and hard to them who are not acquainted with Sinicall computation.
1654 J. Eyre Exact Surveyor 70 In all synicall proportions, observe this general rule, that [etc.].
1673 J. Flamsteed Let. 27 Dec. in Corr. (1995) I. 273 By this sinicall projection..I can find the hour of the day to a minute.
1762 W. Falconer Shipwreck i. 751 In chiliads next the analogy is sought: And on the sinical triangle wrought.
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society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > quadrant, sextant, etc.
quadrant?c1400
quadrate1551
sextant1628
sinical quadrant1669
bow1696
pig yoke1836
hog yoke1897
ham-bone1938
the world > the universe > cosmology > science of observation > astronomical instruments > measuring altitude > [noun] > quadrant or sextant > quadrant > types of
back-staff1627
sinical quadrant1669
Gunter's quadrant1679
meridian quadrant1793
1669 S. Sturmy Mariners Mag. ii. i. 47 Instruments in esteem amongst Navigators..are chiefly..the Plain Scale, the Sinical Quadrant, the Plain Sea-Chard, and the True Sea-Chard.
1695 W. Alingham Geom. Epitomiz'd 69 Several Mathematical Instruments, as sinical Quadrant, Forestaff [etc.].
1701 T. Tuttell Descr. Math. Instruments in J. Moxon Math. made Easie (ed. 3) 18 [Description given, copied by Harris, Kersey, etc.].
1728 E. Chambers Cycl. at Quadrant Sinecal Quadrant, is an Instrument of Use in Navigation..and consists of several concentric quadrantal Arches; divided into eight equal parts by Radii with parallel right Lines crossing each other at right Angles.
1781 J. Adams (title) The Description and Use of a new much-improved Sinical Quadrant.
1788 Trans. Soc. Arts 6 185 The plain Triangle..[is] better than the sinecal Quadrant.
This entry has not yet been fully updated (first published 1911; most recently modified version published online December 2020).
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adj.1593