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lightship

noun

  1. ship that acts as a lighthouse in waters that are too deep or otherwise unsuitable for lighthouse construction
L323261 on Wikidata ↗

Wiktionary

noun

Etymology: From light (noun) + ship (noun). Cognate with Middle Low German lüchteschip (“lightship”), Dutch lichtschip (“lightship”).

  1. A ship riding at anchor and displaying a light for the guidance of sailors, in a position where a fixed lighthouse structure would be impracticable.

    Near-synonyms: lightvessel (usually synonymous), lightboat