adstrate
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ad·strate
(ăd′strāt′)n.
A language that influences a neighboring language, as by being a source of loanwords.
[ad- + (sub)strate.]
ad·stra′tal (-strāt′əl) adj.
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.