/ˌoʊ biː ˌdʒiː waɪ ˈen/
ob-gyn
BrE /ˌəʊ biː ˌdʒiː waɪ ˈen/
NAmE /ˌoʊ biː ˌdʒiː waɪ ˈen/
(NAmE, informal)
[U]
the branches of medicine concerned with the birth of children (= obstetrics ) and the diseases of women (= gynaecology )
[C]
a doctor who is trained in this type of medicine