Search Result for "richter scale":
Wordnet 3.0

NOUN (1)

1. 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; 



WordNet (r) 3.0 (2006):

Richter scale
    n 1: 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