(obsolete) simple past tense and past participle of obtuse.

(obsolete) present participle of obtuse.

(geometry) A triangle one of whose angles is obtuse.

(geometry) Of a triangle, having an obtuse angle.

(mycology) Having a broad and non-pointy umbo.

plural of obtuse triangle

plural of obtuse angle

(mathematics, geometry) An angle that is greater than 90 degrees and less than 180 degrees.

(geometry) obtuse-angled

(geometry) An obtuse triangle.