EXTREME AND MEAN RATIO
\ɛkstɹˈiːm and mˈiːn ɹˈe͡ɪʃɪˌə͡ʊ], \ɛkstɹˈiːm and mˈiːn ɹˈeɪʃɪˌəʊ], \ɛ_k_s_t_ɹ_ˈiː_m a_n_d m_ˈiː_n ɹ_ˈeɪ_ʃ_ɪ__ˌəʊ]\
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In geom. the ratio where a line is so divided that the whole line is to the greater segment as that segment is to the less, or where a line is so divided that the rectangle under the whole line and the lesser segment is equal to the square of the greater segment.
By Daniel Lyons
