PROTOMETALS

\pɹˈə͡ʊtə͡ʊmˌɛtə͡lz], \pɹˈə‍ʊtə‍ʊmˌɛtə‍lz], \p_ɹ_ˈəʊ_t_əʊ_m_ˌɛ_t_əl_z]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.