(geometry) Any angle that is not a right angle or multiple of right angles.

(not comparable, geometry) Having a right angle.

(anatomy) An area located on either side of the human back between the lateral borders of the erector spinae muscles and inferior borders of the twelfth rib, so called because the kidney can be felt at this location.

(optics, physics) The angle that a straight line, ray of light, etc., meeting a surface, makes with a normal to the surface at the point of meeting.

plural of right angle

A usually hand-held grinder which uses a pair of internal gears to place the rotational axis of the grinding or cutting wheel perpendicular to that of the driving motor.

(obsolete, idiomatic) To beg out of a prison window with a cap, or box, let down at the end of a long string.

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

(geometry) An angle of 360 degrees; a full circle.

(geometry) Of a triangle, having three acute angles.