Bb Definition
 bēbē 
    abbreviation
  
 Ball bearing.
 American Heritage 
Base(s) on balls.
 Webster's New World 
Base on balls.
 American Heritage 
    noun
  
 A pellet or ball, usually of steel coated with copper or nickel, that measures740 of an inch (0.44 centimeter) in diameter, used in air rifles.
 American Heritage 
A small pellet of shot, .175 inch in diameter, fired from an air gun (BB gun)
 Webster's New World 
A small pellet of shot, .18 inch in diameter, used in shotgun cartridges.
 Webster's New World 
Alternative spelling of BB.
Wiktionary 
Synonyms: 
  - BB shot
 
Origin of Bb
From BB a size of birdshot pellet intermediate between B and BBB that measures 17100 of an inch (0.43 centimeter) in diameter (from the fact that BB guns originally fired birdshot pellets of this size)
From American Heritage Dictionary of the English Language, 5th Edition





