Late 16th century; earliest use found in Henry Billingsley (d. 1606), merchant and translator. From obtuse + angled, after post-classical Latin obtusangulus. Compare later obtusangular, obtusangulous, and obtuse angular.
Definition of obtuse-angled in US English:
obtuse-angled
adjectiveəbˈtjuːsˌaŋɡld
Having an obtuse angle or angles.
Origin
Late 16th century; earliest use found in Henry Billingsley (d. 1606), merchant and translator. From obtuse + angled, after post-classical Latin obtusangulus. Compare later obtusangular, obtusangulous, and obtuse angular.