ab-(word root) away, fromExamples of words with the root ab-: abnormal, abductAbused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary EmbreeAb (äb, äv, ôv)n. Variant of Av.AB 1 (??b??)n. One of the four major blood groups in the ABO system. Individuals with this blood group have both A and B antigens on the surface of their red blood cells, and no antibodies for A and B in their blood serum.AB 2abbr.1. a. able-bodied seamanb. able seaman2. airman basic3. Alberta4. Latin Artium Baccalaureus (Bachelor of Arts)ab (?b)n. Slang An abdominal muscle: Sit-ups help strengthen the abs.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Ab (æb) n (Judaism) a variant of AvAB abbreviation for 1. (Nautical Terms) Also: a.b. able-bodied seaman 2. (Education) (in the US) Bachelor of Arts 3. (Placename) (esp in postal addresses) Alberta (Canada) symbol for (Biochemistry) a human blood type of the ABO group, containing both the A antigen and the B antigen Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Ab (?b, ?v) n. Av. AB 1. airborne. 2. Airman Basic. 3. Alberta. AB Symbol. a major blood group. Compare ABO system. ab- a prefix occurring in verbs or verbal derivatives borrowed from Latin, where it meant ?off, away?: abhor; abjure; abrade. Compare a- 4, abs-. [