File this one under “Unfamiliar Words for Familiar Concepts,” “Words That Are Missing from the Big Dictionaries,” and “Fun with Greek.”
I know a few cartographic categories: topographic, thematic, political, economic, and so on. But I’d never encountered choropleth until last week, when I came across it on Twitter.
First genuinely surprising choropleth I’ve seen in a long time. pic.twitter.com/YmBT9pUMYQ— Dr. Brian Keegan (@bkeegan) May 20, 2021
I couldn’t find choropleth in the OED, or in Merriam-Webster online, or in Wordnik. It isn’t even in my massive Webster’s Third New International (1986), which does include a related word, chorography: “the art of describing a particular region of district.”