AB

Multiple Entries:
  AB    Ab    ab    ab-  

Concise Oxford English Dictionary © 2008 Oxford University Press:
AB1

▶noun the human blood type (in the ABO system) containing both the A and B antigens.

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AB2

▶abbreviation

• 1 able seaman.

• 2 Alberta (in official postal use).

• 3 US Bachelor of Arts. [from L. Artium Baccalaureus.]

Concise Oxford English Dictionary © 2008 Oxford University Press:
Ab1 (also Av)

▶noun (in the Jewish calendar) the eleventh month of the civil and fifth of the religious year, usually coinciding with parts of July and August.

– origin from Heb. 'āḇ.

Concise Oxford English Dictionary © 2008 Oxford University Press:
Ab2

▶abbreviation Biology antibody.

Concise Oxford English Dictionary © 2008 Oxford University Press:
ab/ab/

▶noun informal an abdominal muscle.

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ab- /əb/ (also abs-)

▶prefix away; from: abdicate.

– origin from L.