† amblygonn.adj.

Forms:

α. 1500s ambligonium, 1600s amblygonium.

β. 1600s ambligone, 1600s amblygone, 1600s–1700s ambligon, 1700s–1800s amblygon.

Origin: Of multiple origins. Partly a borrowing from Latin. Partly a borrowing from French. Etymons: Latin amblygōnium, amblygōnius; French ambligone.

Etymology: Originally (i, as noun) < classical Latin amblygōnium, ambligōnium obtuse-angled triangle (in texts on land surveying, of uncertain date, perhaps 2nd cent. a.d.), use as noun of neuter of amblygōnius, ambligōnius obtuse-angled (see below). Subsequently (as adjective) < (ii) French †ambligone (1562 in Middle French; now amblygone (1679)) and its etymon (iii) classical Latin amblygōnius, ambligōnius obtuse-angled < Hellenistic Greek ἀμβλυγώνιος obtuse-angled < ancient Greek ἀμβλύς blunt (of uncertain origin) + γωνία angle (see -gon comb. form).Compare Spanish ambligonio, adjective (1567). With use as noun compare Hellenistic Greek ἀμβλυγώνιον, denoting an obtuse angle.

Geometry. Obsolete. rare.

A. n.

Originally: a triangle in which one of the angles is obtuse. In later use sometimes also: any geometric figure in which one or more of the angles is obtuse.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > other

amblygon1570

obliquea1608

triangulate1610

pelecoid1706

leaf1716

oblongitude1739

hexagram1863

polystigm1863

tetragram1863

tetrastigm1863

trigram1882

tetromino1954

tromino1954

tetrabolo1961

Penrose tile1975

1570 H. Billingsley tr. Euclid Elements Geom. i. f. 4^v An ambligonium [L. amblygonium] or an obtuse angled triangle.

1623 H. Cockeram Eng. Dict. Amblygone, A flat Triangle.

1721 N. Bailey Universal Etymol. Eng. Dict. Amblygon, a Figure that has an obtuse Angle.

1876 Catal. Special Loan Coll. Sci. Apparatus S. Kensington Mus. (ed. 2) 923 The third branch of these compasses may be altered longitudinally, and is, besides, provided with a joint, so that entirely obtuse angular triangles (amblygons) as well as entirely acute-angled triangles (oxygons) can be taken by the compasses.

B. adj.

Of a geometric figure (in early use esp. a triangle): having an obtuse angle.

ΘΚΠ

the world > relative properties > number > geometry > angle > [adjective] > obtuse angled

blunt-angled1551

obtusiangle?a1560

obtuse1570

obtuse-angled1570

amblygon1605

amblygonal1618

obtusangulous1680

amblygonial1704

obtusangular1706

amblygonous1728

obtuse angular1782

the world > space > shape > angularity > [adjective] > constituting an angle > obtuse > characterized by obtuse angles

obtuse-angled1570

amblygon1605

amblygonal1618

obtusangulous1680

amblygonial1704

obtusangular1706

amblygonous1728

obtuse angular1782

1605 J. Sylvester tr. G. de S. Du Bartas Deuine Weekes & Wks. ii. ii. 475 As the Buildings Ambligone [1621 Ambligon; Fr. Ambligones] May more receaue then Mansions Oxigone.

1796 C. Hutton Math. & Philos. Dict. I. 105 Ambligon, or Ambligonal, signifies obtuse-angular.

a1856 W. Hamilton Lect. Metaphysics (1860) II. xxv. 351 By reference to the angles, they are divided into the three species of rectangular,..into amblygon,..and into oxygon.

This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2020).

单词	amblygon
释义	† amblygonn.adj. Forms: α. 1500s ambligonium, 1600s amblygonium. β. 1600s ambligone, 1600s amblygone, 1600s–1700s ambligon, 1700s–1800s amblygon. Origin: Of multiple origins. Partly a borrowing from Latin. Partly a borrowing from French. Etymons: Latin amblygōnium, amblygōnius; French ambligone. Etymology: Originally (i, as noun) < classical Latin amblygōnium, ambligōnium obtuse-angled triangle (in texts on land surveying, of uncertain date, perhaps 2nd cent. a.d.), use as noun of neuter of amblygōnius, ambligōnius obtuse-angled (see below). Subsequently (as adjective) < (ii) French †ambligone (1562 in Middle French; now amblygone (1679)) and its etymon (iii) classical Latin amblygōnius, ambligōnius obtuse-angled < Hellenistic Greek ἀμβλυγώνιος obtuse-angled < ancient Greek ἀμβλύς blunt (of uncertain origin) + γωνία angle (see -gon comb. form).Compare Spanish ambligonio, adjective (1567). With use as noun compare Hellenistic Greek ἀμβλυγώνιον, denoting an obtuse angle. Geometry. Obsolete. rare. A. n. Originally: a triangle in which one of the angles is obtuse. In later use sometimes also: any geometric figure in which one or more of the angles is obtuse. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > other amblygon1570 obliquea1608 triangulate1610 pelecoid1706 leaf1716 oblongitude1739 hexagram1863 polystigm1863 tetragram1863 tetrastigm1863 trigram1882 tetromino1954 tromino1954 tetrabolo1961 Penrose tile1975 1570 H. Billingsley tr. Euclid Elements Geom. i. f. 4^v An ambligonium [L. amblygonium] or an obtuse angled triangle. 1623 H. Cockeram Eng. Dict. Amblygone, A flat Triangle. 1721 N. Bailey Universal Etymol. Eng. Dict. Amblygon, a Figure that has an obtuse Angle. 1876 Catal. Special Loan Coll. Sci. Apparatus S. Kensington Mus. (ed. 2) 923 The third branch of these compasses may be altered longitudinally, and is, besides, provided with a joint, so that entirely obtuse angular triangles (amblygons) as well as entirely acute-angled triangles (oxygons) can be taken by the compasses. B. adj. Of a geometric figure (in early use esp. a triangle): having an obtuse angle. ΘΚΠ the world > relative properties > number > geometry > angle > [adjective] > obtuse angled blunt-angled1551 obtusiangle?a1560 obtuse1570 obtuse-angled1570 amblygon1605 amblygonal1618 obtusangulous1680 amblygonial1704 obtusangular1706 amblygonous1728 obtuse angular1782 the world > space > shape > angularity > [adjective] > constituting an angle > obtuse > characterized by obtuse angles obtuse-angled1570 amblygon1605 amblygonal1618 obtusangulous1680 amblygonial1704 obtusangular1706 amblygonous1728 obtuse angular1782 1605 J. Sylvester tr. G. de S. Du Bartas Deuine Weekes & Wks. ii. ii. 475 As the Buildings Ambligone [1621 Ambligon; Fr. Ambligones] May more receaue then Mansions Oxigone. 1796 C. Hutton Math. & Philos. Dict. I. 105 Ambligon, or Ambligonal, signifies obtuse-angular. a1856 W. Hamilton Lect. Metaphysics (1860) II. xxv. 351 By reference to the angles, they are divided into the three species of rectangular,..into amblygon,..and into oxygon. This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2020). < n.adj.1570
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