Etymology: Middle English, from Old English gesund; akin to Old High German gisunt healthy
Date: 13th century
a. free from injury or disease ; exhibiting normal health
b. free from flaw, defect, or decay <sound timber> 2. solid, firm; also stable 3. a. free from error, fallacy, or misapprehension <sound reasoning> b. exhibiting or based on thorough knowledge and experience <sound scholarship> c. legally valid <a sound title> d. logically valid and having true premises e. agreeing with accepted views ; orthodox 4. a. thorough b. deep and undisturbed <a sound sleep> c. hard, severe <a sound whipping> 5. showing good judgment or sense <sound advice> Synonyms: see healthy, valid • soundly adverb • soundness noun II. adverb Date: 14th century to the full extent ; thoroughly <sound asleep> III. noun Etymology: Middle English soun, from Anglo-French son, sun, from Latin sonus, from sonare to sound; akin to Old English swinn melody, Sanskrit svanati it sounds 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 sound <a peculiar r-sound> b. value in terms of speech sounds <-cher of teacher and -ture of creature have the same sound> 3. archaic rumor, fame 4. a. meaningless noise b. obsolete meaning c. the impression conveyed ; import 5. hearing distance ; earshot <within sound of your voice> 6. recorded auditory material 7. a particular musical style characteristic of an individual, a group, or an area <the Nashville sound> IV. verb Date: 13th century transitive verb 1. a. to cause to sound <sound 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 sound <sound the alarm> 4. to examine by causing to emit sounds <sound the lungs> 5. chiefly British to convey the impression of ; sound like <that sounds a logical use of resources — Economist> intransitive verb 1. a. to make a sound b. resound c. to give a summons by sound <the bugle sounds to battle> 2. to make or convey an impression especially when heard <it sounds good to me> <you sound just like your mother> • soundable 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 sounding line, probably from Old English or Middle English sund- (as in Old English sundlīne sounding 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 sound intransitive verb 1. a. to ascertain the depth of water especially with a sounding line b. to look into or investigate the possibility <sent commissioners…to sound for peace — Thomas Jefferson> 2. to dive down suddenly — used of a fish or whale VII. noun Etymology: French sonde, from Middle French, literally, sounding line Date: 1739 an elongated instrument for exploring or sounding body cavities
New Collegiate Dictionary. 2001.