Napier's rods () A set of rods, made of bone or other material, each divided into nine spaces, and containing the numbers of a column of the multiplication table |
Threaded (imp. & p. p.) of Thread |
Napier's bones Napier's rods | a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier |
threaded | (of bolts or screws) having screw threads |