Barnard, ChristiaanBar‧nard, Chris‧ti‧aan /ˈbɑːnɑːd $ ˈbɑːrnɑːrd, ˈkrɪstiən/(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)