From Longman Dictionary of Contemporary EnglishABAB /ˌeɪ ˈbiː/ noun [uncountable]HBHM a common type of blood
Examples from the Corpus
AB• The Assembly approved the bill, AB 1542, on a 64-11 vote.• The survey used standard socio-economic groups: AB which covers management, professional, technical and administrative occupations.• Because, as far as Juliet could see, there were two ways in which Donna could have received her AB blood group.• Exposure to the AB compound itself will be much more likely to generate latent inhibition. 