hardpan
[ hahrd-pan ]
/ ˈhɑrdˌpæn /
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noun
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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British Dictionary definitions for hardpan
hardpan
/ (ˈhɑːdˌpæn) /
noun
a hard impervious layer of clay below the soil, resistant to drainage and root growth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Scientific definitions for hardpan
hardpan
[ härd′păn′ ]
A hard, usually clay-rich layer of soil lying at or just below the ground surface, in which soil particles are cemented together by silica, iron oxide, calcium carbonate, or organic matter that has precipitated from water percolating through the soil. Hardpans do not soften when exposed to water. Also called caliche
The American Heritage® Science Dictionary
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