A line that crosses or intersects another line; in seismic surveying, a line perpendicular to the main survey lines used to check data quality.
From 'cross' + 'line' (Old English 'līne', from Latin 'linea'). In technical usage, 'crossline' became a standard term in geophysics for perpendicular measurement lines.
Oil and gas companies use crosslines to double-check their underground maps—it's like drawing a grid on graph paper to make sure you didn't miss anything important beneath your feet.
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