richter scale(n = noun.linkdef) - a logarithmic scale of 1 to 10 formerly used to express the magnitude of an earthquake on the basis of the size of seismograph oscillations;
is a kind of graduated table, ordered series, scale, scale of measurement

richter scale, n. a scale of 0 to 10 for representing the strength of an earthquake.

Etymology:
C. F. Richter, Amer. seismologist d. 1985

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