1. audio.

2. <logic> An inference system A is sound with respect to another system B if A can only reach conclusions which are true in B. A type inference system is considered sound with respect to a semantics if the type inferred for an expression is the same as the type inferred for the meaning of that expression under the semantics.

The dual to soundness is completeness.

(01 Mar 1995)

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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.

(01 Mar 1998)

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