WordReference Random House Unabridged Dictionary of American English © 2019
Ab  (äb, äv),USA pronunciation n. 
  1. JudaismAv.

AB, 
  1. Nautical, Naval TermsSee  able seaman. 
  2. Militaryairborne.
  3. Military[U.S. Air Force.]Airman Basic.
  4. AbbreviationsAlberta, Canada (approved for postal use).
  5. Militaryantiballistic;
    antiballistic missile.

AB,  Symbol, Physiol.
  1. Physiologya major blood group usually enabling a person whose blood is of this type to donate blood to persons of type AB and to receive blood from persons of type O, A, B, or AB. Cf. ABO system.

Ab,  Symbol.
  1. Chemistryalabamine.
  2. Immunologyantibody.

ab-, 
  • a formal element occurring in loanwords from Latin, where it meant "away from'':abdicate; abolition.
  • Also,  a-, abs-. 
    • Latin ab (preposition and prefix) from, away, cognate with Greek apó, Sanskrit ápa, German ab, English of1, off

    ab., 
    1. about.
    2. Sport[Baseball.](times) at bat.

    A.B., 
    1. Nautical, Naval TermsSee  able seaman. 
    2. See  Bachelor of Arts. 
      • Neo-Latin, Medieval Latin Artium Baccalaureus
    3. Sport[Baseball.](times) at bat.

    a.b., [Baseball.]
    1. Sport(times) at bat.

    WordReference Random House Learner's Dictionary of American English © 2019
    AB /ˈeɪˈbi/USA pronunciation   Symbol.
    1. Physiologya major blood group.

    ab-, 
  • prefix. ab- is used before some words and roots to mean "off, away'': abnormal (= away from what is normal).Compare a-2.

  • A.B.,  an abbreviation of:
    1. Education, Bachelor of Arts.

    WordReference Random House Unabridged Dictionary of American English © 2019
    AB, +
  • AbbreviationsAlberta, Canada (approved for postal use).

  • Collins Concise English Dictionary © HarperCollins Publishers::
    AB abbreviation for
    1. Also: a.b. able-bodied seaman
    2. (in the US) Bachelor of Arts
    3. (esp in postal addresses) Alberta (Canada)
    symbol for
    1. a human blood type of the ABO group, containing both the A antigen and the B antigen
    Collins Concise English Dictionary © HarperCollins Publishers::
    ab- prefix
    1. away from; off; outside of; opposite to: abnormal, abaxial, aboral
    Etymology: from Latin ab away from
    ab- prefix
    1. denoting a cgs unit of measurement in the electromagnetic system: abvolt
    Etymology: abstracted from absolute
    'Ab' also found in these entries:
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