range light
noun
1
: either of two or more lights on shore placed to guide a ship by keeping it in line (as through a channel)
2
a
range lights plural
: two white lights in the same vertical plane as the keel with one at least fifteen feet higher than and horizontally distant from the other that may be carried by a steamer under way to indicate her course
b
: the after of these two lights
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Merriam-Webster unabridged
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