In mathematics, a curve that is being unrolled or traced; the original curve from which an involute is derived.
From Latin 'evolvens' (unrolling) + '-ent' suffix. A technical geometric term meaning 'that which unfolds.'
If an involute is like thread unwrapping from a spool, the evolvent is the *spool itself*—it's the base curve that generates the involute through a rolling motion.
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