Correct spelling for the English word "piantication" is [pˌa͡ɪəntɪkˈe͡ɪʃən], [pˌaɪəntɪkˈeɪʃən], [p_ˌaɪ_ə_n_t_ɪ_k_ˈeɪ_ʃ_ə_n] (IPA phonetic alphabet).
Exaggerated sensitization of bacteria by subculturing already sensitized organisms.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.