light·ship, Light-ship n. Naut. A vessel equipped like a lighthouse, carrying at the masthead a brilliant light, and moored off a shoal or place of dangerous navigation where a permanent lighthouse would be impracticable, to serve as a guide for mariners; as, the Ambrose lightship off New York was rammed and damaged in 1950 by the Santa Monica.
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lightship
n : a ship equipped like a lighthouse and anchored where a
permanent lighthouse would be impracticable