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hythergraph

[hahy-ther-graf, -grahf]
noun
  1. a climatic graph showing relationships between temperature and humidity or temperature and precipitation.
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Origin of hythergraph

First recorded in 1915–20; hy(dr)-1 + -ther(m) + -graph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018