Real Dictionary

sound adjective uses
If a structure, part of someone's body, or someone's mind is sound, it is in good condition or healthy.
If someone is in a sound sleep, they are sleeping very deeply.
adjective: If you describe someone's ideas as sound, you mean that you approve of them and think they are correct.
adjective: Sound advice, reasoning, or evidence is reliable and sensible.

Sound in American English
The Öresund

sound in American English 1
vibrations in air, water, etc. that stimulate the auditory nerves and produce the sensation of hearing: although the speed of sound varies considerably, the standard is c. 331 meters per second (c. 740 mph), which is the speed in dry air at STP
intransitive verb: to make or emit a sound
noun: the sensation produced by stimulation of the organs of hearing by vibrations transmitted through the air or other medium
transitive verb: to cause to make or emit a sound

sound in American English 2
free from defect, damage, or decay; whole and in good condition
adjective: free from injury, damage, defect, disease, etc.; in good condition; healthy; robust
adverb: deeply; thoroughly

sound in American English 3
to measure the depth or various depths of (water or a body of water), esp. with a weighted line
intransitive verb: to use the lead and line or some other device for measuring depth, as at sea
noun: a long, slender instrument for sounding or exploring body cavities or canals
transitive verb: to measure or try the depth of (water, a deep hole, etc.) by letting down a lead or plummet at the end of a line, or by some equivalent means

sound in American English 4
a wide channel or strait linking two large bodies of water or separating an island from the mainland
noun: a relatively narrow passage of water between larger bodies of water or between the mainland and an island

Sound in British English
noun

sound in British English 1
noun: 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
verb: to cause (something, such as an instrument) to make a sound or (of an instrument, etc) to emit a sound

sound in British English 2
adjective: free from damage, injury, decay, etc

sound in British English 3
noun: an instrument for insertion into a bodily cavity or passage to dilate strictures, dislodge foreign material, etc
verb: to measure the depth of (a well, the sea, etc) by lowering a plumb line, by sonar, etc

sound in British English 4
noun: a relatively narrow channel between two larger areas of sea or between an island and the mainland

sound noun and verb uses
countable noun: A singer's or band's sound is the distinctive quality of their music.
countable noun: A sound is something that you hear.
link verb: When you are describing a noise, you can talk about the way it sounds.
link verb: When you are describing your impression or opinion of something you have heard about or read about, you can talk about the way it sounds.
link verb: When you talk about the way someone sounds, you are describing the impression you have of them when they speak.
singular noun: The sound on a television, radio, or CD player is what you hear coming from the machine. Its loudness can be controlled.
singular noun: You can describe your impression of something you have heard about or read about by talking about the sound of it.
uncountable noun: Sound is energy that travels in waves through air, water, or other substances, and can be heard.
verb: If something such as a horn or a bell sounds or if you sound it, it makes a noise.
verb: If you sound a warning, you publicly give it. If you sound a note of caution or optimism, you say publicly that you are cautious or optimistic.