| AHS | Academy of Health Sciences; African horse sickness; alveolar hypoventilation syndrome; American Hear... |
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| AHSDF | area health service development fund |
| AIM | Abridged Index Medicus; acute transverse myelopathy; area of interest magnification; artificial inte... |
| AL | angiographic area of lateral projection |
| ALAO | angiographic area of left anterior oblique projection |
stress-bearing region
| relative basal area | An estimate of basal area for trees, such as produced by the Bitterlich sampling technique. (09 Oct 1997) |
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| relief area | In dentistry, the portion of the denture-bearing area over which the denture base is altered to reduce functional pressure. (05 Mar 2000) |
| visual area | Area of the occipital lobe concerned with vision. (12 Dec 1998) |
| pear-shaped area | A cushioned mass of tissue, frequently pear-shaped, located on the alveolar process of the mandible behind the area of the last natural molar tooth. Synonym: pear-shaped area. (05 Mar 2000) |
| medically underserved area | A geographic location which has insufficient health resources (manpower and/or facilities) to meet the medical needs of the resident population. (12 Dec 1998) |
| Celsus' area | <dermatology> An obsolete term for alopecia areata. (05 Mar 2000) |
| rest area | The portion of a tooth structure or of a restoration in a tooth that is prepared to receive the positive seating of the metallic occlusal, incisal, lingual, or cingulum rest of a removable prosthesis. Synonym: rest seat. (05 Mar 2000) |
| retention area | An area of a tooth provided during its preparation for restoration that will aid in holding the restoration in place. See: retention groove, retention point. (05 Mar 2000) |
| peristriate area | Area of the occipital lobe concerned with vision. (12 Dec 1998) |
| riparian area | An area of land directly influenced by water. An ecosystem that is transitional between land and water ecosystems. Riparian areas usually have visible vegetative or physical characteristics reflecting the influence of water. River sides, lake borders, and marshes are typical riparian areas. (05 Dec 1998) |
| Rolando's area | Area of the frontal lobe concerned with primary motor control. It lies anterior to the central sulcus. (12 Dec 1998) |
| mitral area | The region of the chest over the apex of the heart, where the sounds, normal or pathologic, produced at the mitral valves are usually heard most distinctly. (05 Mar 2000) |
| cochlear area | The area inferior to the transverse crest of the fundus of the internal acoustic meatus through which the filaments of the cochlear nerve pass to enter the cochlea; forms the base of the cone-shaped modiolus about which the cochlear canal spirals. See: base of modiolus. Synonym: area cochleae. (05 Mar 2000) |
| Cohnheim's area | A polygonal mosaic-like figure formed by a group of myofibrils, as seen in the cross-section of a skeletal muscle fibre examined under the microscope; a shrinkage artifact of fixation. Synonym: Cohnheim's field. (05 Mar 2000) |
| piriform area | The olfactory cortex, corresponding to the rostral half of the uncus; receiving its major afferents from the olfactory bulb, it is classified as allocortex. See: cerebral cortex. Synonym: olfactory cortex, piriform area. (05 Mar 2000) |