Bow ditch

Bowditch

[bou-dich]
noun
1.
Nathaniel, 1773–1838, U.S. mathematician, astronomer, and navigator.
2.
a handbook of navigation, American Practical Navigator, originally prepared by N. Bowditch and published since 1802 in a series of editions.
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bowditch

noun
United States mathematician and astronomer noted for his works on navigation (1773-1838) 
WordNet® 3.0, © 2006 by Princeton University.
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