2 [sound]
adjective, sounder, soundest.
free from injury, damage, defect, disease, etc.; in good condition; healthy; robust: a sound heart; a sound mind.
financially strong, secure, or reliable: a sound business; sound investments.
competent, sensible, or valid: sound judgment.
having no defect as to truth, justice, wisdom, or reason: sound advice.
of substantial or enduring character: sound moral values.
following in a systematic pattern without any apparent defect in logic: sound reasoning.
uninterrupted and untroubled; deep: sound sleep.
vigorous, thorough, or severe: a sound thrashing.
free from moral defect or weakness; upright, honest, or good; honorable; loyal.
having no legal defect: a sound title to property.
theologically correct or orthodox, as doctrines or a theologian.
deeply; thoroughly: sound asleep.

1150–1200; Middle English sund, Old English gesund (see y-); cognate with Dutch gezond, German gesund

soundly, adverb
soundness, noun

1. unharmed, whole, hale, unbroken, hardy. 2. solvent. 4, 6. valid, rational, logical. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sound1 (saʊnd)
1.  a.  a periodic disturbance in the pressure or density of a fluid or in the elastic strain of a solid, produced by a vibrating object. It has a velocity in air at sea level at 0°C of 331 metres per second (741 miles per hour) and travels as longitudinal waves
 b.  (as modifier): a sound wave
2.  (modifier) of or relating to radio as distinguished from television: sound broadcasting; sound radio
3.  the sensation produced by such a periodic disturbance in the organs of hearing
4.  anything that can be heard
5.  a particular instance, quality, or type of sound: the sound of running water
6.  volume or quality of sound: a radio with poor sound
7.  the area or distance over which something can be heard: to be born within the sound of Big Ben
8.  the impression or implication of something: I don't like the sound of that
9.  phonetics the auditory effect produced by a specific articulation or set of related articulations
10.  slang (often plural) music, esp rock, jazz, or pop
vb (usually foll by in)
11.  to cause (something, such as an instrument) to make a sound or (of an instrument, etc) to emit a sound
12.  to announce or be announced by a sound: to sound the alarm
13.  (intr) (of a sound) to be heard
14.  (intr) to resonate with a certain quality or intensity: to sound loud
15.  (copula) to give the impression of being as specified when read, heard, etc: to sound reasonable
16.  (tr) to pronounce distinctly or audibly: to sound one's consonants
17.  law to have the essential quality or nature (of): an action sounding in damages
[C13: from Old French soner to make a sound, from Latin sonāre, from sonus a sound]

sound2 (saʊnd)
1.  free from damage, injury, decay, etc
2.  firm; solid; substantial: a sound basis
3.  financially safe or stable: a sound investment
4.  showing good judgment or reasoning; sensible; wise: sound advice
5.  valid, logical, or justifiable: a sound argument
6.  holding approved beliefs; ethically correct; upright; honest
7.  (of sleep) deep; peaceful; unbroken
8.  thorough; complete: a sound examination
9.  informal (Brit) excellent
10.  law (of a title, etc) free from defect; legally valid
11.  constituting a valid and justifiable application of correct principles; orthodox: sound theology
12.  logic
 a.  (of a deductive argument) valid
 b.  (of an inductive argument) according with whatever principles ensure the high probability of the truth of the conclusion given the truth of the premises
 c.  another word for consistent
13.  soundly; deeply: now archaic except when applied to sleep
[Old English sund; related to Old Saxon gisund, Old High German gisunt]

sound3 (saʊnd)
1.  to measure the depth of (a well, the sea, etc) by lowering a plumb line, by sonar, etc
2.  to seek to discover (someone's views, etc), as by questioning
3.  (intr) (of a whale, etc) to dive downwards swiftly and deeply
4.  med
 a.  to probe or explore (a bodily cavity or passage) by means of a sound
 b.  to examine (a patient) by means of percussion and auscultation
5.  med an instrument for insertion into a bodily cavity or passage to dilate strictures, dislodge foreign material, etc
[C14: from Old French sonder, from sonde sounding line, probably of Germanic origin; related to Old English sundgyrd sounding pole, Old Norse sund strait, sound4; see swim]

sound4 (saʊnd)
1.  a relatively narrow channel between two larger areas of sea or between an island and the mainland
2.  an inlet or deep bay of the sea
3.  the air bladder of a fish
[Old English sund swimming, narrow sea; related to Middle Low German sunt strait; see sound³]

Sound (saʊnd)
the Sound Danish name: Øresund, Swedish name: Öresund a strait between SW Sweden and Zealand (Denmark), linking the Kattegat with the Baltic: busy shipping lane; spanned by a bridge in 2000. Length of the strait: 113 km (70 miles). Narrowest point: 5 km (3 miles)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"noise," c.1280, soun, from O.Fr. son, from L. sonus "sound," from PIE *swonos, from base *swen- "to sound" (cf. Skt. svanati "it sounds," svanah "sound, tone;" L. sonare "to sound;" O.Ir. senim "the playing of an instrument;" O.E. geswin "music, song," swinsian "to sing;" O.N. svanr, O.E. swan "swan,"
prop. "the sounding bird"). The final -d was established c.1350-1550 as part of a tendency to add -d- after -n-. The verb is attested from c.1300, from L. sonare, from sonus. First record of sound barrier is from 1939. Soundtrack is from 1929; sound check is from 1977; sound effects is 1909, originally live accompaniments to silent films.
"The experts of Victor ... will ... arrange for the synchronized orchestration and sound effects for this picture, in which airplane battles will have an important part." ["Exhibitor's Herald & Moving Picture World," April 28, 1928]

"uninjured," O.E. gesund "sound, safe, healthy," from P.Gmc. *sundas, from root '*swen-to- (cf. O.S. gisund, O.Fris. sund, Du. gezond, O.H.G. gisunt, Ger. gesund "healthy," source of the post-sneezing interjection gesundheit; also O.E. swið "strong," Goth.
swinþs "strong," Ger. geschwind "fast, quick"), with connections in Indo-Iranian and Balto-Slavic. Meaning "financially solid or safe" is attested from 1601; of sleep, "undisturbed," from 1548. Sense of "holding accepted opinions" is from 1526. Soundly "completely" is attested from 1577.

"fathom, probe," 1336 (implied in sounding), from O.Fr. sonder, from sonde "sounding line," probably from a Gmc. source (cf. O.E. sund "water, sea;" see sound (n.2)).

"narrow channel of water," c.1300, from O.N. sund "a strait, swimming," cognate with O.E. sund "power of swimming, water, sea," both from P.Gmc. *swumto-, from base *swem- (see swim (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sound 1 (sound)

  1. Vibrations transmitted through an elastic material or a solid, liquid, or gas, with frequencies in the range of 20 to 20,000 hertz, capable of being detected by human organs of hearing.

  2. Transmitted vibrations of any frequency.

  3. A distinctive noise.

v. sound·ed, sound·ing, sounds
To auscultate.

sound 2

  1. Free from defect, decay, or damage; in good condition.

  2. Free from disease or injury.

sound 3
An instrument used to examine or explore body cavities, as for foreign bodies or other abnormalities, or to dilate strictures in them. v. sound·ed, sound·ing, sounds
To probe a body cavity with a sound.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
sound 1   (sound)  Pronunciation Key 
  1. A type of longitudinal wave that originates as the vibration of a medium (such as a person's vocal cords or a guitar string) and travels through gases, liquids, and elastic solids as variations of pressure and density. The loudness of a sound perceived by the ear depends on the amplitude of the sound wave and is measured in decibels, while its pitch depends on its frequency, measured in hertz.

  2. The sensation produced in the organs of hearing by waves of this type. See Note at ultrasound.

sound 2   (sound)  Pronunciation Key 
  1. A long, wide inlet of the ocean, often parallel to the coast. Long Island Sound, between Long Island and the coast of New England, is an example.

  2. A long body of water, wider than a strait, that connects larger bodies of water.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
At night, sleep soundly in cedar-paneled rooms heated by wood-burning stoves.
Plenty of venting and windows make sure that you stay comfortably and sleep
  soundly no matter the weather.
With the help of minority group blocs, voters soundly rejected the tax.
It's already been tried and was soundly defeated by the entire world.
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