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matrilateral

[ma-truh-lat-er-uh l, mey-]
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adjective
  1. related through the mother, as to a maternal uncle.
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Origin of matrilateral

First recorded in 1950–55; matri- + lateral
Related formsmat·ri·lat·er·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018