† amblygonaladj.
Geometry. Obsolete. rare.
Of a geometric figure (in early use esp. a triangle): having an obtuse angle; = amblygon adj.In later use, recorded only in dictionaries and encyclopedias.
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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
1618 A. Munday tr. Fourth Bk. Amadis de Gaule ii. 6/1 in tr. Anc. Hist. Amadis (1619) The mounting of these staires met not together, neither by line Orthogonall, or Ambligonall in angle [Fr. en ligne ortogonne ny ambligonne].
1796 C. Hutton Math. & Philos. Dict. (new ed.) I. 105 Ambligon, or Ambligonal, signifies obtuse-angular.
This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2020).
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adj.1618