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Logarithmic derivative

ratio of a function's derivative to the function; d(ln|f(x)|)/dx

Pronunciation
/ˌlɔɡəˈrɪðmɪk dəˈrɪvədɪv/
/ˌlɒɡəˈrɪðmɪk dɪˈrɪvətɪv/