Correct spelling for the English word "pneumobacillin" is [njˈuːməbˌasɪlˌɪn], [njˈuːməbˌasɪlˌɪn], [n_j_ˈuː_m_ə_b_ˌa_s_ɪ_l_ˌɪ_n] (IPA phonetic alphabet).
A toxin or toxic protein derived from cultures of the pneumobacillus.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.