| angle of reflection | <optics> The angle that a ray reflected from a surface makes with a line drawn perpendicular to this surface. It is equal to the angle of incidence. (05 Mar 2000) |
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| angle of refraction | <optics> The angle that a ray leaving a refracting medium makes with a line drawn perpendicular to the surface of this medium. (05 Mar 2000) |
| angle of repose | The maximum angle of slope (measured from horizontal plane) at which loose, cohesionless material will come to rest on a pile of similar material. (09 Oct 1997) |
| angle of torsion | The amount of rotation of a long bone along its axis or between two axes, measured in degrees. (05 Mar 2000) |
| anorectal angle | The angle formed by the junction of the rectum with the anus; may be important in maintenance of continence. Synonym: perineal flexure of rectum. (05 Mar 2000) |
| apical angle | The angle between two plane surfaces of a prism. Synonym: refracting angle of a prism. (05 Mar 2000) |
| axial angle | An angle formed by two surfaces of a body, the line of union of which is parallel with its axis; the axial angle's of a tooth are the distobuccal, distolabial, distolingual, mesiobuccal, mesiolabial, and mesiolingual. (05 Mar 2000) |
| basilar angle | An angle formed by the intersection at the basion of lines coming from the nasal spine and the nasal point. (05 Mar 2000) |
| Bennett angle | The angle formed by the sagittal plane and the path of the advancing condyle during lateral mandibular movement as viewed in the horizontal plane. (05 Mar 2000) |
| beta angle | The angle formed by a line connecting the bregma and hormion meeting the radius fixus. (05 Mar 2000) |
| biorbital angle | An angle formed by the meeting of the axes of the orbits. (05 Mar 2000) |
| bond angle | This refers to the angle formed between two nuclei which are linked together. (09 Oct 1997) |
| brewster's angle | <physics> The angle of incidence at which electromagnetic waves reflected from a dielectric medium are completely polarized perpendicular to the plane of incidence, the component polarized parallel to the plane of incidence is completely transmitted. (09 Oct 1997) |
| Broca's angle | More specifically see: Broca's basilar angle, Broca's facial angle, occipital angle of parietal bone. (05 Mar 2000) |
| Broca's basilar angle | The angle formed at the basion of lines drawn from the nasion and the alveolar point. Synonym: Broca's angles. (05 Mar 2000) |