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lituus

[lit-yoo-uh s]
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noun, plural lit·u·i [lit-yoo-ahy] /ˈlɪt yuˌaɪ/.
  1. Geometry. a polar curve generated by the locus of a point moving so that the square of its radius vector varies inversely as the angle the radius vector makes with the polar axis. Equation: θr2 = a.
  2. (in ancient Rome) a crook-shaped staff used by augurs for divination.
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Origin of lituus

1605–15; < Latin; geometrical sense from the curve's resemblance to such a staff
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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