HOUR-GLASS CONTRACTION

\ˈa͡ʊ͡əɡlˈas kəntɹˈakʃən], \ˈa‍ʊ‍əɡlˈas kəntɹˈakʃən], \ˈaʊə_ɡ_l_ˈa_s k_ə_n_t_ɹ_ˈa_k_ʃ_ə_n]\
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1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop
 
1898 - Warner's pocket medical dictionary of today.
By William R. Warner
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland