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partition line

noun Heraldry.
  1. a plain or figured edge between two adjacent areas of an escutcheon, between an ordinary and the field of an escutcheon, or between two adjacent ordinaries.
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Origin of partition line

First recorded in 1710–20
Also called boundary line.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018