Op ‧ pen ‧ hei ‧ mer, J. Rob ‧ ert /ˈɒpənhaɪməʳ $ ˈɑː- ˈrɒbət $ ˈrɑːbərt/ BrE AmE
(1904–67) a US ↑ physicist who led the team of scientists on the Manhattan Project (1942–45), the secret plan to develop the first ↑ atom bomb
Op ‧ pen ‧ hei ‧ mer, J. Rob ‧ ert /ˈɒpənhaɪməʳ $ ˈɑː- ˈrɒbət $ ˈrɑːbərt/ BrE AmE
(1904–67) a US ↑ physicist who led the team of scientists on the Manhattan Project (1942–45), the secret plan to develop the first ↑ atom bomb
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012