| SL | sarcolemma; sclerosing leukoencephalopathy; secondary leukemia; segment length; sensation level; sen... |
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| SLM | sound level meter |
| SPL | skin potential level; sound pressure level; splanchnic; spontaneous lesion; staphylococcal phage lys... |
| SPS | scapuloperoneal syndrome; shoulder pain and stiffness; simple partial seizures; slow-progressive sch... |
| SSD | shaded surface display; single saturating dose; Social Security disability; source-skin distance; so... |
| sound | The air bladder of a fish; as, cod sounds are an esteemed article of food. Origin: AS. Sund a swimming, akin to E. Swim. See Swim. 1. Whole; unbroken; unharmed; free from flaw, defect, or decay; perfect of the kind; as, sound timber; sound fruit; a sound tooth; a sound ship. 2. Healthy; not diseased; not being in a morbid state; said of body or mind; as, a sound body; a sound constitution; a sound understanding. 3. Firm; strong; safe. "The brasswork here, how rich it is in beams, And how, besides, it makes the whole house sound." (Chapman) 4. Free from error; correct; right; honest; true; faithful; orthodox; said of persons; as, a sound lawyer; a sound thinker. "Do not I know you a favorer Of this new seat? Ye are nor sound." (Shak) 5. Founded in truth or right; supported by justice; not to be overthrown on refuted; not fallacious; as, sound argument or reasoning; a sound objection; sound doctrine; sound principles. "Hold fast the form of sound words, which thou hast heard of me." (2 Tim. I. 13) 6. Heavy; laid on with force; as, a sound beating. 7. Undisturbed; deep; profound; as, sound sleep. 8. Founded in law; legal; valid; not defective; as, a sound title to land. Sound is sometimes used in the formation of self-explaining compounds; as, sound-headed, sound-hearted, sound-timbered, etc. Sound currency, a currency whose actual value is the same as its nominal value; a currency which does not deteriorate or depreciate or fluctuate in comparision with the standard of values. Origin: OE. Sound, AS. Sund; akin to D. Gezond, G. Gesund, OHG. Gisunt, Dan. & Sw. Sund, and perhaps to L. Sanus. Cf. Sane. <geography> A narrow passage of water, or a strait between the mainland and an island; also, a strait connecting two seas, or connecting a sea or lake with the ocean; as, the Sound between the Baltic and the german Ocean; Long Island Sound. "The Sound of Denmark, where ships pay toll." (Camden) Sound dues, tolls formerly imposed by Denmark on vessels passing through the Baltic Sound. Origin: AS. Sund a narrow sea or strait; akin to Icel, Sw, Dan. & G. Sund, probably so named because it could be swum across. See Swim. <zoology> A cuttlefish. 1. To measure the depth of; to fathom; especially, to ascertain the depth of by means of a line and plummet. 2. To ascertain, or try to ascertain, the thoughts, motives, and purposes of (a person); to examine; to try; to test; to probe. "I was in jest, And by that offer meant to sound your breast." (Dryden) "I've sounded my Numidians man by man." (Addison) 3. <medicine> To explore, as the bladder or urethra, with a sound; to examine with a sound; also, to examine by auscultation or percussion; as, to sound a patient. Origin: F. Sonder; cf. AS. Sundgyrd a sounding rod, sundline a sounding line (see Sound a narrow passage of water). <medicine> Any elongated instrument or probe, usually metallic, by which cavities of the body are sounded or explored, especially the bladder for stone, or the urethra for a stricture. Origin: F. Sonde. See Sound to fathom. Source: Websters Dictionary (01 Mar 1998) |
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| sound-board | A sounding-board. "To many a row of pipes the sound-board breathes." (Milton) Source: Websters Dictionary (01 Mar 1998) |
| sound localization | Ability to determine the specific location of a sound source. (12 Dec 1998) |
| sound pressure level | A measure of sound energy relative to 0.0002 dynes/cm2, expressed in decibels. (05 Mar 2000) |
| sound spectrography | The graphic registration of the frequency and intensity of sounds, such as speech, infant crying, and animal vocalizations. (12 Dec 1998) |
| succussion sound | The noise made by fluid with overlying air when shaken, such as occurs with gastric dilatation or with fluid and air in a pleural cavity (hydropneumothorax). (05 Mar 2000) |
| Davis interlocking sound | A sound comprised of two instruments with curved male and female tips, used to introduce a catheter into the bladder in the treatment of ruptured urethra; the male sound is introduced into the distal urethra via the meatus and the female sound is passed downward through the bladder neck into the proximal urethra via an open cystotomy; the ends of the two instruments are engaged, with the female sound guiding the male sound upward into the bladder; a catheter is then sutured to the tip of the male sound and withdrawn through the urethra to restore continuity of its lumen. (05 Mar 2000) |
| double-shock sound | Applied by J. B. Bouillaud to describe the cadence of a split-second heart sound, or of the second sound followed by an opening snap or early third heart sound. Synonym: double-shock sound. Origin: Fr. Drum-beat (05 Mar 2000) |
| intensity of sound | The objective measurement of the amplitude of vibration of a sound wave. (05 Mar 2000) |
| tambour sound | Reverberating, musical tone heard as the second heart sound over the aortic area, associated with syphilitic aortic valvular disease. Synonym: tambour sound. Origin: Fr. Sound of drum (05 Mar 2000) |
| third heart sound | Occurs in early diastole and corresponds with the end of the first phase of rapid ventricular filling; normal in children and younger people but abnormal in others. Synonym: third sound. (05 Mar 2000) |
| third sound | Occurs in early diastole and corresponds with the end of the first phase of rapid ventricular filling; normal in children and younger people but abnormal in others. Synonym: third sound. (05 Mar 2000) |
| to-and-fro sound | Doubling of an abnormal murmur usually in systole and diastole and formerly applied to pericardial rubs. (05 Mar 2000) |
| Jewett sound | A short straight sound for dilating the anterior urethra. (05 Mar 2000) |
| first heart sound | Occurs with ventricular systole and is mainly produced by closure of the atrioventricular valves. (05 Mar 2000) |