A bass sound or instrument is the deepest. If a barbershop quartet sings “Happy Birthday” to you, the guy with the lowest voice is singing the bass part. A bass is also a type of saltwater fish.

The word bass has two main meanings with separate pronunciations — bass with a high vowel sound (like base) ironically refers to very low sounds — bass instruments and singers are in the lowest part of the musical range, like the low rumble of a bass guitar. If you say bass with a low vowel sound, it's a type of fish. That kind of bass doesn’t add much to a harmony but is delicious with mashed potatoes.

Definitions of bass
  1. noun
    the lowest part of the musical range
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    type of:
    the property of sound that varies with variation in the frequency of vibration
  2. noun
    the lowest part in polyphonic music
    synonyms: bass part
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    ground bass
    a short melody in the bass that is constantly repeated
    basso continuo, continuo, figured bass, thorough bass
    a bass part written out in full and accompanied by numbers to indicate the chords to be played
    type of:
    part, voice
    the melody carried by a particular voice or instrument in polyphonic music
  3. noun
    the lowest adult male singing voice
    synonyms: bass voice, basso
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    basso profundo
    a very deep bass voice
    type of:
    singing voice
    the musical quality of the voice while singing
  4. noun
    an adult male singer with the lowest voice
    synonyms: basso
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    type of:
    singer, vocaliser, vocalist, vocalizer
    a person who sings
  5. noun
    the member with the lowest range of a family of musical instruments
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    show 6 types...
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    bass fiddle, bass viol, bull fiddle, contrabass, double bass, string bass
    largest and lowest member of the violin family
    bass guitar
    the guitar with six strings that has the lowest pitch
    bass horn, sousaphone, tuba
    the lowest brass wind instrument
    bombard, bombardon
    a large shawm; the bass member of the shawm family
    a bass horn (brass wind instrument) that is the tenor of the tuba family
    bombardon, helicon
    a tuba that coils over the shoulder of the musician
    type of:
    instrument, musical instrument
    any of various devices or contrivances that can be used to produce musical tones or sounds
  6. adjective
    having or denoting a low vocal or instrumental range
    “a bass voice is lower than a baritone voice”
    “a bass clarinet”
    synonyms: deep
    low, low-pitched
    used of sounds and voices; low in pitch or frequency
  7. noun
    any of various North American freshwater fish with lean flesh (especially of the genus Micropterus)
    synonyms: freshwater bass
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    largemouth bass
    flesh of largemouth bass
    smallmouth bass
    flesh of smallmouth bass
    type of:
    freshwater fish
    flesh of fish from fresh water used as food
  8. noun
    the lean flesh of a saltwater fish of the family Serranidae
    synonyms: sea bass
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    striped bass, striper
    caught along the Atlantic coast of the United States
    type of:
    saltwater fish
    flesh of fish from the sea used as food
  9. noun
    nontechnical name for any of numerous edible marine and freshwater spiny-finned fishes
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    freshwater bass
    North American food and game fish
    type of:
    percoid, percoid fish, percoidean
    any of numerous spiny-finned fishes of the order Perciformes
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