DIFFERENTIAL THERMOMETER

\dˌɪfəɹˈɛnʃə͡l θɜːmˈɒmɪtə], \dˌɪfəɹˈɛnʃə‍l θɜːmˈɒmɪtə], \d_ˌɪ_f_ə_ɹ_ˈɛ_n_ʃ_əl θ_ɜː_m_ˈɒ_m_ɪ_t_ə]\
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1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1871 - The Cabinet Dictionary of the English Language