The art or science which treats of
lighthouses and signal lights.
Pharos
[Noun]
Webster's Dictionary 1828
1. A light-house or tower which anciently stood on a small isle of that name, adjoining the Egyptian shore, over against Alexandria. It consisted of several stories and
galleries, with a
lantern on the top, which was kept burning at night as a guide to seamen.
2. Any light-house for the direction of seamen; a watch-tower; a
beacon.
Pharos
[Noun]
Webster's Dictionary 1913