Noah Webster's 1828 American Dictionary of the English Language is regarded by many as the finest English
dictionary ever published. The dictionary is available in many forms. I made the content available here for my own purposes,
out of personal admiration for this particular dictionary.
QUAD'RATRIX, n. 1. A square or squared figure. 2. In geometry, a mechanical line by means of which we can find right lines equal to the circumference of circles or other curves and their several parts.
quadratrix appears in definitions for these words: