Slide Rule Definition

noun
A once-common manual device like a ruler but with a central sliding piece, both parts being marked with various number scales: used to find square roots, logarithms, quotients, etc.
Webster's New World
A device consisting of two logarithmically scaled rules mounted to slide along each other so that multiplication, division, and other more complex computations are reduced to the mechanical equivalent of addition or subtraction.
American Heritage
Synonyms:

Other Word Forms of Slide Rule

Noun

Singular:
slide rule
Plural:
slide-rules

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slide rule