sound¹ (sound)

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[Middle English soun, from Old French son, from Latin sonus.]

noun 

1. 1. Vibrations transmitted through an elastic solid or a liquid or gas, with frequencies in the approximate range of 20 to 20,000 hertz, capable of being detected by human organs of hearing.
   2. Transmitted vibrations of any frequency.
   3. The sensation stimulated in the organs of hearing by such vibrations in the air or other medium.
   4. Such sensations considered as a group.
2. A distinctive noise: a hollow sound.
3. The distance over which something can be heard: within sound of my voice.
4. Linguistics
   1. An articulation made by the vocal apparatus: a vowel sound.
   2. The distinctive character of such an articulation: The words and have the same sound.
5. A mental impression; an implication: didn't like the sound of the invitation.
6. Auditory material that is recorded, as for a movie.
7. Meaningless noise.
8. Music A distinctive style, as of an orchestra or a singer.
9. Archaic Rumor; report.

verb: sound·ed, sound·ing, sounds. 

intransitive verb 

1. 1. To make or give forth a sound: The siren sounded.
   2. To be given forth as a sound: The fanfare sounded.
2. To present a particular impression: That argument sounds reasonable.

transitive verb 

1. To cause to give forth or produce a sound: sounded the gong.
2. To summon, announce, or signal by a sound: sound a warning.
3. Linguistics To articulate; pronounce: sound a vowel.
4. To make known; celebrate: “Nations unborn your mighty names shall sound” (Alexander Pope)
5. To examine (a body organ or part) by causing to emit sound; auscultate.

phrasal verbs

sound off

To express one's views vigorously: was always sounding off about higher taxes.

To count cadence when marching in military formation.

sound³ (sound)

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[Middle English, from Old English sund, swimming, sea.]

noun 

1. 1. A long, relatively wide body of water, larger than a strait or a channel, connecting larger bodies of water.
   2. A long, wide ocean inlet.
2. The air bladder of a fish.

sound⁴ (sound)

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[Middle English sounden, from Old French sonder, from sonde, sounding line, probably of Germanic origin.]

verb: sound·ed, sound·ing, sounds. 

transitive verb 

1. To measure the depth of (water), especially by means of a weighted line; fathom.
2. To try to learn the attitudes or opinions of: sounded out her feelings.
3. To probe (a body cavity) with a sound.

intransitive verb 

1. To measure depth.
2. To dive swiftly downward. Used of a whale or fish.
3. To look into a possibility; investigate.

noun 

An instrument used to examine or explore body cavities, as for foreign bodies or other abnormalities, or to dilate strictures in them.

derivatives

sound́a·ble

adjective