| ASP | abnormal spinal posture; acute symmetric polyarthritis; African swine pox; aged substrate plasma; al... |
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| CSA | Canadian Standards Association; canavaninosuccinic acid; carbonyl salicylamide; cell surface antigen... |
| AACN | American Association of Colleges of Nursing; American Association of Critical-Care Nurses |
| AADE | American Association of Dental Editors; American Association of Dental Examiners |
| AAMC | American Association of Medical Clinics; Association of American Medical Colleges |
primary's area
| frontal triangle | A triangle bounded above by the maximum frontal diameter and laterally by lines joining the extremities of this diameter with the glabella. (05 Mar 2000) |
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| frontal tuber | The most prominent portion of the frontal bone on either side. Synonym: tuber frontale, eminentia frontalis, frontal tuber. (05 Mar 2000) |
| frontal veins | The superficial veins draining the frontal cortex and emptying into the superior sagittal sinus. Synonym: supratrochlear veins. (05 Mar 2000) |
| frontal zone contraction theory | Model proposed to account for the movement of giant amoebae in which cytoplasmic contraction at the front of the leading pseudopod (fountain zone) pulls viscoelastic cytoplasm forward in the centre of the cell and forms a tube of more rigid cytoplasm immediately below the plasma membrane behind the active region. The peripheral contracted cytoplasm relaxes into a weaker gel at the rear and is pulled forward in its turn. Contrasts with the ectoplasmic tube contraction model. (18 Nov 1997) |
| acoustic area | The floor of the lateral recess of the fourth ventricle, extending medially to the limiting sulcus and overlying the cochlear and vestibular nuclei of the rhombencephalon. Synonym: area acustica. (05 Mar 2000) |
| adaptive management area | Landscape units designated for development and testing of technical and social approaches to achieving desired ecological, economic, and other social objectives. (05 Dec 1998) |
| air quality maintenance area | Specific populated area where air quality is a problem for one or more pollutants (Portland-Vancouver, Salem, Eugene-Springfield, Medford-Ashland). (05 Dec 1998) |
| anterior intercondylar area of tibia | The broad depressed area between the tibial condyles anteriorly to which attach the anterior ends of the menisci and the anterior cruciate ligament. Synonym: area intercondylaris anterior tibiae. (05 Mar 2000) |
| aortic area | The region of the chest wall over the second right costal cartilage, where sounds produced at the aortic orifice are often best heard. (05 Mar 2000) |
| apical area | The area about the root end of a tooth. (05 Mar 2000) |
| area | Origin: L. Area a broad piece of level gro. Cf. Are. 1. Any plane surface, as of the floor of a room or church, or of the ground within an inclosure; an open space in a building. "The Alban lake . . . Looks like the area of some vast amphitheater." (Addison) 2. The inclosed space on which a building stands. 3. The sunken space or court, giving ingress and affording light to the basement of a building. 4. An extent of surface; a tract of the earth's surface; a region; as, vast uncultivated areas. 5. <geometry> The superficial contents of any figure; the surface included within any given lines; superficial extent; as, the area of a square or a triangle. 6. <biology> A spot or small marked space; as, the germinative area. 7. Extent; scope; range; as, a wide area of thought. "The largest area of human history and man's common nature." (F. Harrison) Dry area. See Dry. Source: Websters Dictionary (01 Mar 1998) |
| area acustica | The floor of the lateral recess of the fourth ventricle, extending medially to the limiting sulcus and overlying the cochlear and vestibular nuclei of the rhombencephalon. Synonym: area acustica. (05 Mar 2000) |
| area centralis | An oval area of the sensory retina, 3 by 5 mm, temporal to the optic disk corresponding to the posterior pole of the eye; at its centre is the central fovea, which contains only retinal cones. Synonym: area centralis, macula lutea, macular area, punctum luteum, Soemmerring's spot, yellow spot. (05 Mar 2000) |
| area cochleae | 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) |
| area cribrosa papillae renalis | The apex of a renal papilla pierced by 10 to 22 openings of the papillary ducts, the foramina papillaria. Synonym: area cribrosa papillae renalis. (05 Mar 2000) |