planosol noun. ['pleɪnǝ(ʊ)sɒl, 'planǝ(ʊ)-] M20.
[from PLANO-¹ + -SOL.]
Soil Science. An intrazonal soil with a thin, strongly leached surface horizon overlying a compacted hardpan or clay-pan, occurring on flat uplands with poor drainage.

■ plano'solic adjective M20.

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