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  1. Oxford American Dictionary

    hardpan

    • IPA[ˈhärdˌpan]

    美式

    • n.
      a hardened impervious layer, typically of clay, occurring in or below the soil and impairing drainage and plant growth.

    • noun: hardpan

    • 更多解釋

    hardpan

    • IPA[ˈhɑːdpan]

    英式

    • n.
      a hardened impervious layer, typically of clay, occurring in or below the soil and impairing ...

    Oxford Dictionary