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The following 4 entries include the term napier's.
Napier's bones
noun: a set of graduated rods (as of wood or bone) invented by John Napier and used for multiplication and division based on the principles of logarithms
Napier's analogies
plural noun: four formulas giving the tangent of half the sum or difference of two of the angles or sides of a spherical triangle in terms of the others
Napier's circular parts
plural noun: five parts of a right spherical triangle including the two legs and the complements of their opposite angles and of the hypotenuse
Napier's rule
noun: either of two rules in spherical trigonometry: the sine of any part is equal to the product of the tangents of the adjacent parts and the sine of any part is equal to the product of the cosines of the opposite parts
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Merriam-Webster unabridged
