Pronunciation: [mˈastɒnkəs] (IPA)
Correct spelling for the English word "mastoncus" is [mˈastɒnkəs], [mˈastɒnkəs], [m_ˈa_s_t_ɒ_n_k_ə_s] (IPA phonetic alphabet).
A tumor or swelling of the breasts.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Correct spelling for mastoncus