PETIOLUS

\pˌɛtɪˈə͡ʊləs], \pˌɛtɪˈə‍ʊləs], \p_ˌɛ_t_ɪ__ˈəʊ_l_ə_s]\
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1846 - Medical lexicon: a dictionary of medical science
By Robley Dunglison
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe