TRIANGLE OF ELBOW

\tɹˈa͡ɪaŋɡə͡l ɒv ˈɛlbə͡ʊ], \tɹˈa‍ɪaŋɡə‍l ɒv ˈɛlbə‍ʊ], \t_ɹ_ˈaɪ__a_ŋ_ɡ_əl ɒ_v ˈɛ_l_b_əʊ]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland