B2 Syllabification: (B)Pronunciation: /bē/Translate B | into French | into German | into Italian | into Spanish Definition of B abbreviation (used in recording moves in chess) bishop:Be5 black (used in describing grades of pencil lead):2HB pencils (in personal ads) Black. bomber (in designations of US aircraft types):a B52 a dry cell battery size. symbol the chemical element boron. Physics magnetic flux density. B in other Oxford dictionaries Definition of B in the British & World English dictionary