obtuse angle

noun

1. an angle greater than 90° but less than 180°.

obtuse angle

1. An angle whose measure is between 90° and 180°.

2. Compare acute angle

obtuse angle

1. An angle that measures more than 90 degrees but less than 180 degrees. (Compare acute angle and right angle.)

Other Word Forms

• obtuse-angled adjective
• obtuse-angular adjective

Word History and Origins

Origin of obtuse angle¹

First recorded in 1560–70