Merriam-Webster Collegiate Dictionary - sound

 I. adjective  Etymology: Middle English, from Old English gesund; akin to Old High German gisunt healthy  Date: 13th century  1.  a. free from injury or disease ; exhibiting normal health  b. free from flaw, defect, or decay ~ timber  2. solid, firm; also stable  3.  a. free from error, fallacy, or misapprehension ~ reasoning  b. exhibiting or based on thorough knowledge and experience ~ scholarship  c. legally valid a ~ title  d. logically valid and having true premises  e. agreeing with accepted views ; orthodox  4.  a. thorough  b. deep and undisturbed a ~ sleep  c. hard, severe a ~ whipping  5. showing good judgment or sense ~ advice  Synonyms: see healthy, valid  • ~ly adverb  • ~ness noun  II. adverb  Date: 14th century to the full extent ; thoroughly ~ asleep  III. noun  Etymology: Middle English soun, from Anglo-French son, sun, from Latin sonus, from sonare to ~; akin to Old English swinn melody, Sanskrit svanati it ~s  Date: 13th century  1.  a. a particular auditory impression ; tone  b. the sensation perceived by the sense of hearing  c. mechanical radiant energy that is transmitted by longitudinal pressure waves in a material medium (as air) and is the objective cause of hearing  2.  a. a speech ~ a peculiar r-~  b. value in terms of speech ~s -cher of teacher and -ture of creature have the same ~  3. archaic rumor, fame  4.  a. meaningless noise  b. obsolete meaning  c. the impression conveyed ; import  5. hearing distance ; earshot within ~ of your voice  6. recorded auditory material  7. a particular musical style characteristic of an individual, a group, or an area the Nashville ~  IV. verb  Date: 13th century  transitive verb  1.  a. to cause to ~ ~ a trumpet  b. pronounce 3a  2. to put into words ; voice  3.  a. to make known ; proclaim  b. to order, signal, or indicate by a ~ ~ the alarm  4. to examine by causing to emit ~s ~ the lungs  5. chiefly British to convey the impression of ; ~ like that ~s a logical use of resources — Economist  intransitive verb  1.  a. to make a ~  b. re~  c. to give a summons by ~ the bugle ~s to battle  2. to make or convey an impression especially when heard it ~s good to me you ~ just like your mother  • ~able adjective  V. noun  Etymology: Middle English, from Old English sund swimming, sea & Old Norse sund swimming, strait; akin to Old English swimman to swim  Date: 14th century  1.  a. a long broad inlet of the ocean generally parallel to the coast  b. a long passage of water connecting two larger bodies (as a sea with the ocean) or separating a mainland and an island  2. the air bladder of a fish  VI. verb  Etymology: Middle English, from Middle French sonder, from Old French *sonde ~ing line, probably from Old English or Middle English sund- (as in Old English sundline ~ing line) from sund sea  Date: 15th century  transitive verb  1. to measure the depth of ; fathom  2. to try to find out the views or intentions of ; probe — often used with out  3. to explore or examine (a body cavity) with a ~  intransitive verb  1.  a. to ascertain the depth of water especially with a ~ing line  b. to look into or investigate the possibility sent commissioners…to ~ for peace — Thomas Jefferson  2. to dive down suddenly — used of a fish or whale  VII. noun  Etymology: French sonde, from Middle French, literally, ~ing line  Date: 1739 an elongated instrument for exploring or ~ing body cavities