| ESD | electronic summation device; electrostatic discharge; emission spectrometric device; end-systolic di... |
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| S | Greek capital letter sigma; syphilis; summation of series |
| Sp | the most posterior point on the posterior contour of the sella turcica; species; specific; specimen;... |
| Isa | spatial average intensity [pulse] |
| Isapa | spatial average pulse average |
| DSR | Dynamic Spatial Reconstructor |
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| SD | Spatial Disorientation |
| SF | Spatial frequency |
| SPAMM | Spatial modulation of magnetization |
| USN | Unilateral Spatial Neglect |
| summation | The act of summing, or forming a sum, or total amount; also, an aggregate. "Of this series no summation is possible to a finite intellect." (De Quincey) Origin: Cf. F. Sommation. See Sum. Source: Websters Dictionary (01 Mar 1998) |
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| summation beat | A beat triggered by more than a single electrical impulse, when the wave fronts coincide to act together on a single final pathway of activity; in the electrocardiogram, the atrial or ventricular complex when either atria or ventricles are activated jointly by two simultaneous or nearly simultaneous invading impulses. Synonym: combination beat, mixed beat, summation beat. (05 Mar 2000) |
| summation gallop | Gallop rhythm in which the gallop sound is due to superimposition of third and fourth heart sounds; sometimes heard in normal subjects with tachycardia, but usually indicative of myocardial disease. Synonym: S7 gallop, S7. Systolic gallop, obsolete term for a triple cadence to the heart sounds in which the extra sound occurs during systole, usually in the form of a systolic "click." (05 Mar 2000) |
| summation of stimuli | Cumulative muscular or neural effects produced by the frequent repetition of stimuli. (05 Mar 2000) |
| visual-spatial agnosia | The inability to localise objects or to appreciate distance, motion, and spatial relationships; caused by lesion in the occipital lobe. Compare: simultanagnosia. (05 Mar 2000) |
| spatial | Relating to space or a space. (05 Mar 2000) |
| spatial acuity | The detection of the shape of a test object; e.g., perceiving polygons of the same size but with different numbers of sides. (05 Mar 2000) |
| spatial behaviour | Reactions of an individual or groups of individuals with relation to the immediate surrounding area including the animate or inanimate objects within that area. (12 Dec 1998) |
| spatial filter | <radiobiology> Device consisting of a lens pair and a pinhole aperture stop. Intensity fluctuations over the spatial extent of a laser beam are removed by passing the focused beam through the aperture stop. The pinhole must be placed in a vacuum to prevent air breakdown by the focused beam. These filters are used to counter the effects caused by self-focusing. (09 Oct 1997) |
| spatial formula | A chemical formula in which the arrangement of the atoms or atomic groupings in space are indicated. Synonym: spatial formula. (05 Mar 2000) |
| spatial localization | The reference of a visual sensation to a definite locality in space. (05 Mar 2000) |
| spatial sensing | Mechanism of sensing a gradient in which the signal is compared at different points on the cell surface and cell movement directed accordingly. Translocation of all or part of the cell is not required. See: temporal gradient sensing, pseudospatial gradient sensing. (18 Nov 1997) |
| spatial vector | A cardiac vector represented in more than one plane simultaneously; two-or three-dimensional orientation of a vector. (05 Mar 2000) |
| spatial vectorcardiography | Three-dimensional vectorcardiography in which vector loops are inscribed in frontal, sagittal, and horizontal planes. (05 Mar 2000) |
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