Correct spelling for the English word "bucardia" is [bjuːkˈɑːdi͡ə], [bjuːkˈɑːdiə], [b_j_uː_k_ˈɑː_d_iə] (IPA phonetic alphabet).
Extreme hypertrophy of the heart, corbovinum.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.