adstratum

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ad·stra·tum

(ăd′strā′təm, -străt′əm)
n. pl. ad·stra·ta (-strā′tə, -străt′ə)
An adstrate.

[ad- + stratum (on the model of substratum).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.