| AAE | active assistive exercise; acute allergic encephalitis; American Association of Endodontists; annulo... |
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| AAI | acute alveolar injury; Adolescent Alienation Index; American Association of Immunologists; atrial in... |
| AAM | acute aseptic meningitis; American Academy of Microbiology; amino acid mixture; African American Mal... |
| AAMS | acute aseptic meningitis syndrome |
| AAR | active avoidance reaction; acute articular rheumatism; antigen-antiglobulin reaction |
| subpubic angle | The angle formed between the inferior rami of the pubic bones. In the female, the angle approximates that angle between the widely extended thumb and index finger (90 |
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| substernal angle | The angle between the lower borders of the costal cartilages of the two sides as they approach the sternum. Synonym: angulus infrasternalis, substernal angle. (05 Mar 2000) |
| Daubenton's angle | An angle formed by the junction, at the opisthion, of lines coming from the basion and from the projection in the median plane of the lower border of the orbits. See: Daubenton's line, Daubenton's plane. Synonym: angulus occipitalis ossis parietalis, occipital angle of parietal bone. (05 Mar 2000) |
| superior angle of scapula | Formerly named the medial angle, it lies at the junction of the superior and medial borders of the bone. Synonym: angulus superior scapulae. (05 Mar 2000) |
| sylvian angle | The angle formed by the sylvian line and a line perpendicular to the horizontal plane tangential to the highest point of the hemisphere. (05 Mar 2000) |
| disparity angle | The difference in position of images on the retina, still permitting fusion. (05 Mar 2000) |
| duodenojejunal angle | An abrupt bend in the small intestine at the junction of the duodenum and jejunum. Synonym: flexura duodenojejunalis, duodenojejunal angle. (05 Mar 2000) |
| impedance angle | A term expressing the ratio of electric resistance to electric capacitance (ohms to microfarads) in the tissues of the body or any other substance. (05 Mar 2000) |
| incident angle | <optics> The angle that a ray entering a refracting medium makes with a line drawn perpendicular to the surface of this medium, the angle that a ray striking a reflecting surface makes with a line perpendicular to this surface. Synonym: incident angle. (05 Mar 2000) |
| incisal guide angle | The angle formed with the horizontal plane by drawing a line in the sagittal plane between incisal edges of the maxillary and mandibular central incisors when the teeth are in centric occlusion. (05 Mar 2000) |
| Q angle | <anatomy> The angle formed by lines representing the resultant pull of the quadriceps muscle and the axis of the patellar tendon. (05 Mar 2000) |
| Quatrefages' angle | An angle formed by the meeting of the prolongation of two lines tangential to the most prominent part of the zygomatic arch and to the parietofrontal suture on each side; when the lines remain parallel the angle is zero; when they diverge it is negative. Synonym: Quatrefages' angle. (05 Mar 2000) |
| inferior angle of scapula | The acute angle formed by junction of the medial and lateral borders of the scapula. Synonym: angulus inferior scapulae. (05 Mar 2000) |
| infrasternal angle | The angle between the lower borders of the costal cartilages of the two sides as they approach the sternum. Synonym: angulus infrasternalis, substernal angle. (05 Mar 2000) |
| iridocorneal angle | The acute angle between the iris and the cornea at the periphery of the anterior chamber of the eye. Synonym: angulus iridocornealis, angle of iris, angulus iridis, filtration angle. (05 Mar 2000) |