One of the mysteries of the English language finally explained.
1Chiefly in technical contexts: a scan made looking from the side; a signal resulting from sideways scanning; specifically one obtained using side-scan sonar or radar.
Designating side-looking sonar and radar, especially on a ship; relating to, employing, or derived from such a system.
1950s; earliest use found in U.S. Patents. From side + scan.
side scan/ˈsʌɪd ˌskan/
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