ultisol

[ uhl-tuh-sawl, -sol ]
/ ˈʌl təˌsɔl, -ˌsɒl /

noun

a weathered, red and yellow acidic soil of warm, humid areas that is agriculturally productive when treated with lime and organic fertilizers.

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Origin of ultisol

First recorded in 1965–70; ulti(mate) + -sol
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020