Pronunciation: [θˈa͡ɪɹɒnkəs] (IPA)
Correct spelling for the English word "thyroncus" is [θˈa͡ɪɹɒnkəs], [θˈaɪɹɒnkəs], [θ_ˈaɪ_ɹ_ɒ_n_k_ə_s] (IPA phonetic alphabet).
Thyreoncus.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Correct spelling for thyroncus