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Fun fact! If you were to write down the name of every English number in order (one, two, three, four…) you wouldn’t use a single letter B until you reached one billion.

B is sometimes a misspelling of be.

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Definition of the noun b

What does b mean as a name of something?

noun - plural: -

  1. aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil
  2. originally thought to be a single vitamin but now separated into several B vitamins
  3. a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
    • lexical domain: Substances - nouns denoting substances
    • synonyms of B: atomic number 5 / boron
    • more generic terms: chemical element / element = any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
    • substance of: borax = an ore of boron consisting of hydrated sodium borate; kernite = a light soft mineral consisting of hydrated sodium borate in crystalline form
  4. a logarithmic unit of sound intensity equal to 10 decibels
    • lexical domain: Quantities - nouns denoting quantities and units of measure
    • synonym of B: Bel
    • more generic term: sound unit = any acoustic unit of measurement
  5. (physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter
  6. the 2nd letter of the Roman alphabet
  7. the blood group whose red cells carry the B antigen

Alternative definition of the noun b


  1. A personality type of someone who is relaxed and easygoing and able to engage in leisure activities without worrying about work.
  2. An academic grade, better than a C and worse than an A
  3. Signifies a second-tier or second class of a given commodity, group, or category, as in B-movie, B-list, etc.
  4. [music] The seventh note in the C major scale.

Other definitions of b

What does b also mean?


  1. [cricket] the number of balls faced by a batsman
  2. The quantity one billion (1,000,000,000), usually used to signify a sum of money
  3. [British] The grade of pencil that makes darker marks than grade HB but lighter marks than grade 2B; a pencil with soft lead.
  4. [chess] Bishop


  1. Latn-def, en, letter, 2, bee


  1. Latn-def, en, ordinal, 2, bee


  1. Latn-def, en, letter, 2, bee


  1. Latn-def, en, ordinal, 2, bee


  1. [astronomy] latitude in the galactic coordinate system
  2. [physics] barn
  3. [computing] bit
  4. [cricket] bye

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