surficial

[ser-fish-uh l]
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adjective

of or relating to a surface, especially the land surface: a surficial geologic deposit.

Origin of surficial

1890–95; blend of surface and superficial
Related formssur·fi·cial·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of surficial