paragon

The word 'paragon' entered English in the mid-16th century from the obsolete French paragon, via Italian paragone, meaning "touchstone" or "comparison." The Italian term derives from the Medieval Greek phrase para konēn, literally "beside a whetstone," where a touchstone (a black stone used to test the purity of gold) was used as a standard for comparison. Thus, the core logic moves from a literal "stone for testing" to a metaphorical "model for testing or judging excellence." Over time, the meaning shifted from the tool of comparison itself to the supreme example or perfect model against which others are measured.

Structure: para (beside) + gon (sharpening stone) para (Greek origin, meaning "beside, alongside"); gon (from Greek akōnē, meaning "whetstone, sharpening stone" via Italian paragone)