Search Result for "choropleth map":
Wordnet 3.0

NOUN (1)

1. a map that uses graded differences in shading or color or the placing of symbols inside defined areas on the map in order to indicate the average values of some property or quantity in those areas; 



WordNet (r) 3.0 (2006):

choropleth map
    n 1: a map that uses graded differences in shading or color or
         the placing of symbols inside defined areas on the map in
         order to indicate the average values of some property or
         quantity in those areas