α. 1500s subtendente, 1500s–1800s subtendent.
β. 1600s–1800s subtendant.
† subtendentadj.n.
Geometry. Obsolete.
A. adj.
Subtending. Also: subtended or contained by (rare).
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the world > relative properties > number > geometry > line > [adjective] > subtending
subtendent?a1560
subtending?a1560
?a1560 L. Digges Geom. Pract.: Pantometria (1571) i. vi. sig. C iij v In equiangle triangles, al their sides are proportional aswel such as conteyne the equall angles, as also their subtendente sides.
1688 R. Holme Acad. Armory iii. iii. 139/2 A Cord, Chord, or Subtendant Line; is a streight Line which joyns to an Arch or Bow by its ends.
1710 W. Pickering Marrow Math. ii. xii. 108 The power of the side is to the power of the perpendicular let fall from any of the Angles to the subtendent side in proportion sesquitertia.
1875 Mem. Royal Astron. Soc. 42 9 As the cusps closed both must have been within the space subtendent by half the length of the slit.
B. n.
A subtending line or arc.
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the world > relative properties > number > geometry > line > [noun] > subtending
subtendent1570
subtense1614
1570 J. Dee in H. Billingsley tr. Euclid Elements Geom. Math. Præf. sig. cijv Square then, halfe the Subtendent of that watry Superficies.
1684 J. Wallis Treat. Angular Sections ii. 8 For the first Arch we take βθζδ to which Z is a subtendent likewise.
1734 J. Kelly Mod. Navigator's Compleat Tutor (ed. 2) II. 324 Draw the Subtendents AK and BS.
1850 T. S. Baynes tr. A. Arnauld & P. Nicole Port-Royal Logic iv. iv. 314 It is not the meeting of two lines which has sides and a base or subtendant.
This entry has been updated (OED Third Edition, June 2012; most recently modified version published online June 2021).
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adj.n.?a1560