Relating to or bounded by curved lines; composed of or formed by curves.
From Latin 'curvus' (curved) and 'linea' (line) with the adjectival suffix '-al'. Used since the 17th century in mathematics and geometry to describe shapes bounded by curves.
In mathematics, 'curvilineal coordinates' are like a curved grid system used by physicists studying the universe—instead of straight x and y axes, they curve to match the shape of what they're measuring.
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