centerline

or cen·ter line

[ sen-ter-lahyn ]
/ ˈsɛn tərˌlaɪn /

noun

any line that bisects a plane figure: the centerline of a building plan.
a line along the center of a road or highway dividing it into separate sections for traffic moving in opposite directions.
Radio. the perpendicular bisector of the line connecting two radio transmitters.

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Origin of centerline

First recorded in 1800–10; center + line1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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