Conchoid Definition

A curve traced by an end point of a segment of constant length located on a straight line that rotates about a fixed point, while the other end point moves along a straight line that does not go through the fixed point.
Webster's New World

Origin of Conchoid

  • From Latin concha (“mussel”) (from Ancient Greek κόνχη (konchē)) +‎ -oid. Due to the curved patterns on a mussel shell.

    From Wiktionary

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