THORINGTON'S DISK
\θˈɔːɹɪŋtənz dˈɪsk], \θˈɔːɹɪŋtənz dˈɪsk], \θ_ˈɔː_ɹ_ɪ_ŋ_t_ə_n_z d_ˈɪ_s_k]\
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An instrument used for retinoscopy. [Lat.]
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An instrument used in retinoscopy.
By Smith Ely Jelliffe
