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green earth

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noun
  1. a pigment used in painting consisting mainly of iron silicate, characterized chiefly by its variable grayish-green hue, lack of tinting strength, and permanence.
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Origin of green earth

First recorded in 1785–95
Also called terra verde.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018