Bar ‧ nard, Chris ‧ ti ‧ aan /ˈbɑːnɑːd $ ˈbɑːrnɑːrd, ˈkrɪstiən/ BrE AmE
(1922–2001) a South African doctor who in 1967 performed the first ever heart ↑ transplant (=an operation to take a heart from someone who has just died and put it into a living person)