01 n. A tower or other building with a powerful light at top, erected at the entrance of a port, or at some important point on a coast, to serve …
pl.
Lighthouses ((līt"houz`ĕz))
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1.
A tower or other building with a powerful light at top, erected at the entrance of a port, or at some important point on a coast, to serve as a guide to mariners at night; a pharos.