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
WordReference Random House Learner's Dictionary of American English © 2020
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 © 2020
    AB, +
  • AbbreviationsAlberta, Canada (approved for postal use).

  • WordReference Random House Unabridged Dictionary of American English © 2020
    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.

    'ab-' also found in these entries:
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