understratum

[ uhn-der-strey-tuhm, -strat-uhm ]

noun,plural un·der·stra·ta

[uhn-der-strey-tuh, -strat-uh], /ˈʌn dərˌstreɪ tə, -ˌstræt ə/, un·der·strat·ums.

a substratum.

Origin of understratum

¹

First recorded in 1725–35; under- + stratum

Words Nearby understratum

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use understratum in a sentence

Where the city is now built it is fine siliceous sand, supported by an understratum of clay, which is of varied colors.
Petals Plucked from Sunny Climes | Sylvia Sunshine
But there is an understratum of deep, calm sea, which the breath of the wildest tempest can never reach.
The Life and Public Services of James A. Garfield | Emma Elizabeth Brown

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